Automatically flip material icons in RTL. (#12876)

I'm not really sure how to test this without a reference test, since
eventually we want to move this to a font feature and thus the obvious
test (looking for the Transform widget) isn't really valid.

bin/internal/material_fonts.version

-https://storage.googleapis.com/flutter_infra/flutter/fonts/13ac995daa9dda0a6ba0a45f1fccc541e616a74c/fonts.zip
+https://storage.googleapis.com/flutter_infra/flutter/fonts/7a25ab00acc9a9e4a498641dcbd5a923a1249239/fonts.zip

dev/tools/update_icons.dart

@@ -28,6 +28,82 @@ const Map<String, String> kIdentifierRewrites = const <String, String>{
   'class': 'class_',
 };
 
+final Set<String> kMirroredIcons = new Set<String>.from(<String>[
+  // This list is obtained from:
+  // http://google.github.io/material-design-icons/#icons-in-rtl
+  'arrow_back',
+  'arrow_back_ios',
+  'arrow_forward',
+  'arrow_forward_ios',
+  'arrow_left',
+  'arrow_right',
+  'assignment',
+  'assignment_return',
+  'backspace',
+  'battery_unknown',
+  'call_made',
+  'call_merge',
+  'call_missed',
+  'call_missed_outgoing',
+  'call_received',
+  'call_split',
+  'chevron_left',
+  'chevron_right',
+  'chrome_reader_mode',
+  'device_unknown',
+  'dvr',
+  'event_note',
+  'featured_play_list',
+  'featured_video',
+  'first_page',
+  'flight_land',
+  'flight_takeoff',
+  'format_indent_decrease',
+  'format_indent_increase',
+  'format_list_bulleted',
+  'forward',
+  'functions',
+  'help',
+  'help_outline',
+  'input',
+  'keyboard_backspace',
+  'keyboard_tab',
+  'label',
+  'label_important',
+  'label_outline',
+  'last_page',
+  'launch',
+  'list',
+  'live_help',
+  'mobile_screen_share',
+  'multiline_chart',
+  'navigate_before',
+  'navigate_next',
+  'next_week',
+  'note',
+  'open_in_new',
+  'playlist_add',
+  'queue_music',
+  'redo',
+  'reply',
+  'reply_all',
+  'screen_share',
+  'send',
+  'short_text',
+  'show_chart',
+  'sort',
+  'star_half',
+  'subject',
+  'trending_flat',
+  'toc',
+  'trending_down',
+  'trending_up',
+  'undo',
+  'view_list',
+  'view_quilt',
+  'wrap_text',
+]);
+
 void main(List<String> args) {
   // If we're run from the `tools` dir, set the cwd to the repo root.
   if (path.basename(Directory.current.path) == 'tools')
@@ -94,9 +170,10 @@ String getIconDeclaration(String line) {
   final String codepoint = tokens[1];
   final String identifier = kIdentifierRewrites[name] ?? name;
   final String description = name.replaceAll('_', ' ');
+  final String rtl = kMirroredIcons.contains(name) ? ', matchTextDirection: true' : '';
   return '''
 
   /// <p><i class="material-icons md-36">$name</i> &#x2014; material icon named "$description".</p>
-  static const IconData $identifier = const IconData(0x$codepoint, fontFamily: 'MaterialIcons');
+  static const IconData $identifier = const IconData(0x$codepoint, fontFamily: 'MaterialIcons'$rtl);
 ''';
 }

packages/flutter/lib/src/material/date_picker.dart

@@ -599,31 +599,8 @@ class _MonthPickerState extends State<MonthPicker> {
     });
   }
 
-  Icon _getPreviousMonthIcon(TextDirection textDirection) {
-    assert(textDirection != null);
-    switch (textDirection) {
-      case TextDirection.rtl:
-        return const Icon(Icons.chevron_right);
-      case TextDirection.ltr:
-        return const Icon(Icons.chevron_left);
-    }
-    return null;
-  }
-
-  Icon _getNextMonthIcon(TextDirection textDirection) {
-    assert(textDirection != null);
-    switch (textDirection) {
-      case TextDirection.rtl:
-        return const Icon(Icons.chevron_left);
-      case TextDirection.ltr:
-        return const Icon(Icons.chevron_right);
-    }
-    return null;
-  }
-
   @override
   Widget build(BuildContext context) {
-    final TextDirection textDirection = Directionality.of(context);
     final MaterialLocalizations localizations = MaterialLocalizations.of(context);
     return new SizedBox(
       width: _kMonthPickerPortraitWidth,
@@ -642,7 +619,7 @@ class _MonthPickerState extends State<MonthPicker> {
             top: 0.0,
             start: 8.0,
             child: new IconButton(
-              icon: _getPreviousMonthIcon(textDirection),
+              icon: const Icon(Icons.chevron_left),
               tooltip: localizations.previousMonthTooltip,
               onPressed: _isDisplayingFirstMonth ? null : _handlePreviousMonth,
             ),
@@ -651,7 +628,7 @@ class _MonthPickerState extends State<MonthPicker> {
             top: 0.0,
             end: 8.0,
             child: new IconButton(
-              icon: _getNextMonthIcon(textDirection),
+              icon: const Icon(Icons.chevron_right),
               tooltip: localizations.nextMonthTooltip,
               onPressed: _isDisplayingLastMonth ? null : _handleNextMonth,
             ),

packages/flutter/lib/src/material/icons.dart

@@ -202,10 +202,10 @@ class Icons {
   static const IconData archive = const IconData(0xe149, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">arrow_back</i> &#x2014; material icon named "arrow back".</p>
-  static const IconData arrow_back = const IconData(0xe5c4, fontFamily: 'MaterialIcons');
+  static const IconData arrow_back = const IconData(0xe5c4, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_back_ios</i> &#x2014; material icon named "arrow back ios".</p>
-  static const IconData arrow_back_ios = const IconData(0xe5e0, fontFamily: 'MaterialIcons');
+  static const IconData arrow_back_ios = const IconData(0xe5e0, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_downward</i> &#x2014; material icon named "arrow downward".</p>
   static const IconData arrow_downward = const IconData(0xe5db, fontFamily: 'MaterialIcons');
@@ -220,16 +220,16 @@ class Icons {
   static const IconData arrow_drop_up = const IconData(0xe5c7, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">arrow_forward</i> &#x2014; material icon named "arrow forward".</p>
-  static const IconData arrow_forward = const IconData(0xe5c8, fontFamily: 'MaterialIcons');
+  static const IconData arrow_forward = const IconData(0xe5c8, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_forward_ios</i> &#x2014; material icon named "arrow forward ios".</p>
-  static const IconData arrow_forward_ios = const IconData(0xe5e1, fontFamily: 'MaterialIcons');
+  static const IconData arrow_forward_ios = const IconData(0xe5e1, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_left</i> &#x2014; material icon named "arrow left".</p>
-  static const IconData arrow_left = const IconData(0xe5de, fontFamily: 'MaterialIcons');
+  static const IconData arrow_left = const IconData(0xe5de, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_right</i> &#x2014; material icon named "arrow right".</p>
-  static const IconData arrow_right = const IconData(0xe5df, fontFamily: 'MaterialIcons');
+  static const IconData arrow_right = const IconData(0xe5df, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">arrow_upward</i> &#x2014; material icon named "arrow upward".</p>
   static const IconData arrow_upward = const IconData(0xe5d8, fontFamily: 'MaterialIcons');
@@ -244,7 +244,7 @@ class Icons {
   static const IconData assessment = const IconData(0xe85c, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">assignment</i> &#x2014; material icon named "assignment".</p>
-  static const IconData assignment = const IconData(0xe85d, fontFamily: 'MaterialIcons');
+  static const IconData assignment = const IconData(0xe85d, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">assignment_ind</i> &#x2014; material icon named "assignment ind".</p>
   static const IconData assignment_ind = const IconData(0xe85e, fontFamily: 'MaterialIcons');
@@ -253,7 +253,7 @@ class Icons {
   static const IconData assignment_late = const IconData(0xe85f, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">assignment_return</i> &#x2014; material icon named "assignment return".</p>
-  static const IconData assignment_return = const IconData(0xe860, fontFamily: 'MaterialIcons');
+  static const IconData assignment_return = const IconData(0xe860, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">assignment_returned</i> &#x2014; material icon named "assignment returned".</p>
   static const IconData assignment_returned = const IconData(0xe861, fontFamily: 'MaterialIcons');
@@ -289,7 +289,7 @@ class Icons {
   static const IconData av_timer = const IconData(0xe01b, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">backspace</i> &#x2014; material icon named "backspace".</p>
-  static const IconData backspace = const IconData(0xe14a, fontFamily: 'MaterialIcons');
+  static const IconData backspace = const IconData(0xe14a, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">backup</i> &#x2014; material icon named "backup".</p>
   static const IconData backup = const IconData(0xe864, fontFamily: 'MaterialIcons');
@@ -307,7 +307,7 @@ class Icons {
   static const IconData battery_std = const IconData(0xe1a5, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">battery_unknown</i> &#x2014; material icon named "battery unknown".</p>
-  static const IconData battery_unknown = const IconData(0xe1a6, fontFamily: 'MaterialIcons');
+  static const IconData battery_unknown = const IconData(0xe1a6, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">beach_access</i> &#x2014; material icon named "beach access".</p>
   static const IconData beach_access = const IconData(0xeb3e, fontFamily: 'MaterialIcons');
@@ -469,22 +469,22 @@ class Icons {
   static const IconData call_end = const IconData(0xe0b1, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">call_made</i> &#x2014; material icon named "call made".</p>
-  static const IconData call_made = const IconData(0xe0b2, fontFamily: 'MaterialIcons');
+  static const IconData call_made = const IconData(0xe0b2, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_merge</i> &#x2014; material icon named "call merge".</p>
-  static const IconData call_merge = const IconData(0xe0b3, fontFamily: 'MaterialIcons');
+  static const IconData call_merge = const IconData(0xe0b3, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_missed</i> &#x2014; material icon named "call missed".</p>
-  static const IconData call_missed = const IconData(0xe0b4, fontFamily: 'MaterialIcons');
+  static const IconData call_missed = const IconData(0xe0b4, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_missed_outgoing</i> &#x2014; material icon named "call missed outgoing".</p>
-  static const IconData call_missed_outgoing = const IconData(0xe0e4, fontFamily: 'MaterialIcons');
+  static const IconData call_missed_outgoing = const IconData(0xe0e4, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_received</i> &#x2014; material icon named "call received".</p>
-  static const IconData call_received = const IconData(0xe0b5, fontFamily: 'MaterialIcons');
+  static const IconData call_received = const IconData(0xe0b5, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_split</i> &#x2014; material icon named "call split".</p>
-  static const IconData call_split = const IconData(0xe0b6, fontFamily: 'MaterialIcons');
+  static const IconData call_split = const IconData(0xe0b6, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">call_to_action</i> &#x2014; material icon named "call to action".</p>
   static const IconData call_to_action = const IconData(0xe06c, fontFamily: 'MaterialIcons');
@@ -565,10 +565,10 @@ class Icons {
   static const IconData check_circle_outline = const IconData(0xe92d, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">chevron_left</i> &#x2014; material icon named "chevron left".</p>
-  static const IconData chevron_left = const IconData(0xe5cb, fontFamily: 'MaterialIcons');
+  static const IconData chevron_left = const IconData(0xe5cb, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">chevron_right</i> &#x2014; material icon named "chevron right".</p>
-  static const IconData chevron_right = const IconData(0xe5cc, fontFamily: 'MaterialIcons');
+  static const IconData chevron_right = const IconData(0xe5cc, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">child_care</i> &#x2014; material icon named "child care".</p>
   static const IconData child_care = const IconData(0xeb41, fontFamily: 'MaterialIcons');
@@ -577,7 +577,7 @@ class Icons {
   static const IconData child_friendly = const IconData(0xeb42, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">chrome_reader_mode</i> &#x2014; material icon named "chrome reader mode".</p>
-  static const IconData chrome_reader_mode = const IconData(0xe86d, fontFamily: 'MaterialIcons');
+  static const IconData chrome_reader_mode = const IconData(0xe86d, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">class</i> &#x2014; material icon named "class".</p>
   static const IconData class_ = const IconData(0xe86e, fontFamily: 'MaterialIcons');
@@ -766,7 +766,7 @@ class Icons {
   static const IconData device_hub = const IconData(0xe335, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">device_unknown</i> &#x2014; material icon named "device unknown".</p>
-  static const IconData device_unknown = const IconData(0xe339, fontFamily: 'MaterialIcons');
+  static const IconData device_unknown = const IconData(0xe339, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">devices</i> &#x2014; material icon named "devices".</p>
   static const IconData devices = const IconData(0xe1b1, fontFamily: 'MaterialIcons');
@@ -859,7 +859,7 @@ class Icons {
   static const IconData drive_eta = const IconData(0xe613, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">dvr</i> &#x2014; material icon named "dvr".</p>
-  static const IconData dvr = const IconData(0xe1b2, fontFamily: 'MaterialIcons');
+  static const IconData dvr = const IconData(0xe1b2, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">edit</i> &#x2014; material icon named "edit".</p>
   static const IconData edit = const IconData(0xe3c9, fontFamily: 'MaterialIcons');
@@ -904,7 +904,7 @@ class Icons {
   static const IconData event_busy = const IconData(0xe615, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">event_note</i> &#x2014; material icon named "event note".</p>
-  static const IconData event_note = const IconData(0xe616, fontFamily: 'MaterialIcons');
+  static const IconData event_note = const IconData(0xe616, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">event_seat</i> &#x2014; material icon named "event seat".</p>
   static const IconData event_seat = const IconData(0xe903, fontFamily: 'MaterialIcons');
@@ -964,10 +964,10 @@ class Icons {
   static const IconData favorite_border = const IconData(0xe87e, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">featured_play_list</i> &#x2014; material icon named "featured play list".</p>
-  static const IconData featured_play_list = const IconData(0xe06d, fontFamily: 'MaterialIcons');
+  static const IconData featured_play_list = const IconData(0xe06d, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">featured_video</i> &#x2014; material icon named "featured video".</p>
-  static const IconData featured_video = const IconData(0xe06e, fontFamily: 'MaterialIcons');
+  static const IconData featured_video = const IconData(0xe06e, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">feedback</i> &#x2014; material icon named "feedback".</p>
   static const IconData feedback = const IconData(0xe87f, fontFamily: 'MaterialIcons');
@@ -1063,7 +1063,7 @@ class Icons {
   static const IconData fingerprint = const IconData(0xe90d, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">first_page</i> &#x2014; material icon named "first page".</p>
-  static const IconData first_page = const IconData(0xe5dc, fontFamily: 'MaterialIcons');
+  static const IconData first_page = const IconData(0xe5dc, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">fitness_center</i> &#x2014; material icon named "fitness center".</p>
   static const IconData fitness_center = const IconData(0xeb43, fontFamily: 'MaterialIcons');
@@ -1087,10 +1087,10 @@ class Icons {
   static const IconData flight = const IconData(0xe539, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">flight_land</i> &#x2014; material icon named "flight land".</p>
-  static const IconData flight_land = const IconData(0xe904, fontFamily: 'MaterialIcons');
+  static const IconData flight_land = const IconData(0xe904, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">flight_takeoff</i> &#x2014; material icon named "flight takeoff".</p>
-  static const IconData flight_takeoff = const IconData(0xe905, fontFamily: 'MaterialIcons');
+  static const IconData flight_takeoff = const IconData(0xe905, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">flip</i> &#x2014; material icon named "flip".</p>
   static const IconData flip = const IconData(0xe3e8, fontFamily: 'MaterialIcons');
@@ -1144,10 +1144,10 @@ class Icons {
   static const IconData format_color_text = const IconData(0xe23c, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">format_indent_decrease</i> &#x2014; material icon named "format indent decrease".</p>
-  static const IconData format_indent_decrease = const IconData(0xe23d, fontFamily: 'MaterialIcons');
+  static const IconData format_indent_decrease = const IconData(0xe23d, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">format_indent_increase</i> &#x2014; material icon named "format indent increase".</p>
-  static const IconData format_indent_increase = const IconData(0xe23e, fontFamily: 'MaterialIcons');
+  static const IconData format_indent_increase = const IconData(0xe23e, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">format_italic</i> &#x2014; material icon named "format italic".</p>
   static const IconData format_italic = const IconData(0xe23f, fontFamily: 'MaterialIcons');
@@ -1156,7 +1156,7 @@ class Icons {
   static const IconData format_line_spacing = const IconData(0xe240, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">format_list_bulleted</i> &#x2014; material icon named "format list bulleted".</p>
-  static const IconData format_list_bulleted = const IconData(0xe241, fontFamily: 'MaterialIcons');
+  static const IconData format_list_bulleted = const IconData(0xe241, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">format_list_numbered</i> &#x2014; material icon named "format list numbered".</p>
   static const IconData format_list_numbered = const IconData(0xe242, fontFamily: 'MaterialIcons');
@@ -1192,7 +1192,7 @@ class Icons {
   static const IconData forum = const IconData(0xe0bf, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">forward</i> &#x2014; material icon named "forward".</p>
-  static const IconData forward = const IconData(0xe154, fontFamily: 'MaterialIcons');
+  static const IconData forward = const IconData(0xe154, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">forward_10</i> &#x2014; material icon named "forward 10".</p>
   static const IconData forward_10 = const IconData(0xe056, fontFamily: 'MaterialIcons');
@@ -1213,7 +1213,7 @@ class Icons {
   static const IconData fullscreen_exit = const IconData(0xe5d1, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">functions</i> &#x2014; material icon named "functions".</p>
-  static const IconData functions = const IconData(0xe24a, fontFamily: 'MaterialIcons');
+  static const IconData functions = const IconData(0xe24a, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">g_translate</i> &#x2014; material icon named "g translate".</p>
   static const IconData g_translate = const IconData(0xe927, fontFamily: 'MaterialIcons');
@@ -1306,10 +1306,10 @@ class Icons {
   static const IconData hearing = const IconData(0xe023, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">help</i> &#x2014; material icon named "help".</p>
-  static const IconData help = const IconData(0xe887, fontFamily: 'MaterialIcons');
+  static const IconData help = const IconData(0xe887, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">help_outline</i> &#x2014; material icon named "help outline".</p>
-  static const IconData help_outline = const IconData(0xe8fd, fontFamily: 'MaterialIcons');
+  static const IconData help_outline = const IconData(0xe8fd, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">high_quality</i> &#x2014; material icon named "high quality".</p>
   static const IconData high_quality = const IconData(0xe024, fontFamily: 'MaterialIcons');
@@ -1372,7 +1372,7 @@ class Icons {
   static const IconData info_outline = const IconData(0xe88f, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">input</i> &#x2014; material icon named "input".</p>
-  static const IconData input = const IconData(0xe890, fontFamily: 'MaterialIcons');
+  static const IconData input = const IconData(0xe890, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">insert_chart</i> &#x2014; material icon named "insert chart".</p>
   static const IconData insert_chart = const IconData(0xe24b, fontFamily: 'MaterialIcons');
@@ -1420,7 +1420,7 @@ class Icons {
   static const IconData keyboard_arrow_up = const IconData(0xe316, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">keyboard_backspace</i> &#x2014; material icon named "keyboard backspace".</p>
-  static const IconData keyboard_backspace = const IconData(0xe317, fontFamily: 'MaterialIcons');
+  static const IconData keyboard_backspace = const IconData(0xe317, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">keyboard_capslock</i> &#x2014; material icon named "keyboard capslock".</p>
   static const IconData keyboard_capslock = const IconData(0xe318, fontFamily: 'MaterialIcons');
@@ -1432,7 +1432,7 @@ class Icons {
   static const IconData keyboard_return = const IconData(0xe31b, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">keyboard_tab</i> &#x2014; material icon named "keyboard tab".</p>
-  static const IconData keyboard_tab = const IconData(0xe31c, fontFamily: 'MaterialIcons');
+  static const IconData keyboard_tab = const IconData(0xe31c, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">keyboard_voice</i> &#x2014; material icon named "keyboard voice".</p>
   static const IconData keyboard_voice = const IconData(0xe31d, fontFamily: 'MaterialIcons');
@@ -1441,13 +1441,13 @@ class Icons {
   static const IconData kitchen = const IconData(0xeb47, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">label</i> &#x2014; material icon named "label".</p>
-  static const IconData label = const IconData(0xe892, fontFamily: 'MaterialIcons');
+  static const IconData label = const IconData(0xe892, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">label_important</i> &#x2014; material icon named "label important".</p>
-  static const IconData label_important = const IconData(0xe937, fontFamily: 'MaterialIcons');
+  static const IconData label_important = const IconData(0xe937, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">label_outline</i> &#x2014; material icon named "label outline".</p>
-  static const IconData label_outline = const IconData(0xe893, fontFamily: 'MaterialIcons');
+  static const IconData label_outline = const IconData(0xe893, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">landscape</i> &#x2014; material icon named "landscape".</p>
   static const IconData landscape = const IconData(0xe3f7, fontFamily: 'MaterialIcons');
@@ -1468,10 +1468,10 @@ class Icons {
   static const IconData laptop_windows = const IconData(0xe321, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">last_page</i> &#x2014; material icon named "last page".</p>
-  static const IconData last_page = const IconData(0xe5dd, fontFamily: 'MaterialIcons');
+  static const IconData last_page = const IconData(0xe5dd, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">launch</i> &#x2014; material icon named "launch".</p>
-  static const IconData launch = const IconData(0xe895, fontFamily: 'MaterialIcons');
+  static const IconData launch = const IconData(0xe895, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">layers</i> &#x2014; material icon named "layers".</p>
   static const IconData layers = const IconData(0xe53b, fontFamily: 'MaterialIcons');
@@ -1519,10 +1519,10 @@ class Icons {
   static const IconData linked_camera = const IconData(0xe438, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">list</i> &#x2014; material icon named "list".</p>
-  static const IconData list = const IconData(0xe896, fontFamily: 'MaterialIcons');
+  static const IconData list = const IconData(0xe896, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">live_help</i> &#x2014; material icon named "live help".</p>
-  static const IconData live_help = const IconData(0xe0c6, fontFamily: 'MaterialIcons');
+  static const IconData live_help = const IconData(0xe0c6, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">live_tv</i> &#x2014; material icon named "live tv".</p>
   static const IconData live_tv = const IconData(0xe639, fontFamily: 'MaterialIcons');
@@ -1720,7 +1720,7 @@ class Icons {
   static const IconData mms = const IconData(0xe618, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">mobile_screen_share</i> &#x2014; material icon named "mobile screen share".</p>
-  static const IconData mobile_screen_share = const IconData(0xe0e7, fontFamily: 'MaterialIcons');
+  static const IconData mobile_screen_share = const IconData(0xe0e7, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">mode_comment</i> &#x2014; material icon named "mode comment".</p>
   static const IconData mode_comment = const IconData(0xe253, fontFamily: 'MaterialIcons');
@@ -1771,7 +1771,7 @@ class Icons {
   static const IconData movie_filter = const IconData(0xe43a, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">multiline_chart</i> &#x2014; material icon named "multiline chart".</p>
-  static const IconData multiline_chart = const IconData(0xe6df, fontFamily: 'MaterialIcons');
+  static const IconData multiline_chart = const IconData(0xe6df, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">music_note</i> &#x2014; material icon named "music note".</p>
   static const IconData music_note = const IconData(0xe405, fontFamily: 'MaterialIcons');
@@ -1789,10 +1789,10 @@ class Icons {
   static const IconData nature_people = const IconData(0xe407, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">navigate_before</i> &#x2014; material icon named "navigate before".</p>
-  static const IconData navigate_before = const IconData(0xe408, fontFamily: 'MaterialIcons');
+  static const IconData navigate_before = const IconData(0xe408, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">navigate_next</i> &#x2014; material icon named "navigate next".</p>
-  static const IconData navigate_next = const IconData(0xe409, fontFamily: 'MaterialIcons');
+  static const IconData navigate_next = const IconData(0xe409, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">navigation</i> &#x2014; material icon named "navigation".</p>
   static const IconData navigation = const IconData(0xe55d, fontFamily: 'MaterialIcons');
@@ -1816,7 +1816,7 @@ class Icons {
   static const IconData new_releases = const IconData(0xe031, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">next_week</i> &#x2014; material icon named "next week".</p>
-  static const IconData next_week = const IconData(0xe16a, fontFamily: 'MaterialIcons');
+  static const IconData next_week = const IconData(0xe16a, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">nfc</i> &#x2014; material icon named "nfc".</p>
   static const IconData nfc = const IconData(0xe1bb, fontFamily: 'MaterialIcons');
@@ -1834,7 +1834,7 @@ class Icons {
   static const IconData not_listed_location = const IconData(0xe575, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">note</i> &#x2014; material icon named "note".</p>
-  static const IconData note = const IconData(0xe06f, fontFamily: 'MaterialIcons');
+  static const IconData note = const IconData(0xe06f, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">note_add</i> &#x2014; material icon named "note add".</p>
   static const IconData note_add = const IconData(0xe89c, fontFamily: 'MaterialIcons');
@@ -1873,7 +1873,7 @@ class Icons {
   static const IconData open_in_browser = const IconData(0xe89d, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">open_in_new</i> &#x2014; material icon named "open in new".</p>
-  static const IconData open_in_new = const IconData(0xe89e, fontFamily: 'MaterialIcons');
+  static const IconData open_in_new = const IconData(0xe89e, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">open_with</i> &#x2014; material icon named "open with".</p>
   static const IconData open_with = const IconData(0xe89f, fontFamily: 'MaterialIcons');
@@ -2077,7 +2077,7 @@ class Icons {
   static const IconData play_for_work = const IconData(0xe906, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">playlist_add</i> &#x2014; material icon named "playlist add".</p>
-  static const IconData playlist_add = const IconData(0xe03b, fontFamily: 'MaterialIcons');
+  static const IconData playlist_add = const IconData(0xe03b, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">playlist_add_check</i> &#x2014; material icon named "playlist add check".</p>
   static const IconData playlist_add_check = const IconData(0xe065, fontFamily: 'MaterialIcons');
@@ -2140,7 +2140,7 @@ class Icons {
   static const IconData queue = const IconData(0xe03c, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">queue_music</i> &#x2014; material icon named "queue music".</p>
-  static const IconData queue_music = const IconData(0xe03d, fontFamily: 'MaterialIcons');
+  static const IconData queue_music = const IconData(0xe03d, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">queue_play_next</i> &#x2014; material icon named "queue play next".</p>
   static const IconData queue_play_next = const IconData(0xe066, fontFamily: 'MaterialIcons');
@@ -2170,7 +2170,7 @@ class Icons {
   static const IconData redeem = const IconData(0xe8b1, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">redo</i> &#x2014; material icon named "redo".</p>
-  static const IconData redo = const IconData(0xe15a, fontFamily: 'MaterialIcons');
+  static const IconData redo = const IconData(0xe15a, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">refresh</i> &#x2014; material icon named "refresh".</p>
   static const IconData refresh = const IconData(0xe5d5, fontFamily: 'MaterialIcons');
@@ -2215,10 +2215,10 @@ class Icons {
   static const IconData replay_5 = const IconData(0xe05b, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">reply</i> &#x2014; material icon named "reply".</p>
-  static const IconData reply = const IconData(0xe15e, fontFamily: 'MaterialIcons');
+  static const IconData reply = const IconData(0xe15e, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">reply_all</i> &#x2014; material icon named "reply all".</p>
-  static const IconData reply_all = const IconData(0xe15f, fontFamily: 'MaterialIcons');
+  static const IconData reply_all = const IconData(0xe15f, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">report</i> &#x2014; material icon named "report".</p>
   static const IconData report = const IconData(0xe160, fontFamily: 'MaterialIcons');
@@ -2314,7 +2314,7 @@ class Icons {
   static const IconData screen_rotation = const IconData(0xe1c1, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">screen_share</i> &#x2014; material icon named "screen share".</p>
-  static const IconData screen_share = const IconData(0xe0e2, fontFamily: 'MaterialIcons');
+  static const IconData screen_share = const IconData(0xe0e2, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">sd_card</i> &#x2014; material icon named "sd card".</p>
   static const IconData sd_card = const IconData(0xe623, fontFamily: 'MaterialIcons');
@@ -2332,7 +2332,7 @@ class Icons {
   static const IconData select_all = const IconData(0xe162, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">send</i> &#x2014; material icon named "send".</p>
-  static const IconData send = const IconData(0xe163, fontFamily: 'MaterialIcons');
+  static const IconData send = const IconData(0xe163, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">sentiment_dissatisfied</i> &#x2014; material icon named "sentiment dissatisfied".</p>
   static const IconData sentiment_dissatisfied = const IconData(0xe811, fontFamily: 'MaterialIcons');
@@ -2419,10 +2419,10 @@ class Icons {
   static const IconData shopping_cart = const IconData(0xe8cc, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">short_text</i> &#x2014; material icon named "short text".</p>
-  static const IconData short_text = const IconData(0xe261, fontFamily: 'MaterialIcons');
+  static const IconData short_text = const IconData(0xe261, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">show_chart</i> &#x2014; material icon named "show chart".</p>
-  static const IconData show_chart = const IconData(0xe6e1, fontFamily: 'MaterialIcons');
+  static const IconData show_chart = const IconData(0xe6e1, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">shuffle</i> &#x2014; material icon named "shuffle".</p>
   static const IconData shuffle = const IconData(0xe043, fontFamily: 'MaterialIcons');
@@ -2491,7 +2491,7 @@ class Icons {
   static const IconData snooze = const IconData(0xe046, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">sort</i> &#x2014; material icon named "sort".</p>
-  static const IconData sort = const IconData(0xe164, fontFamily: 'MaterialIcons');
+  static const IconData sort = const IconData(0xe164, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">sort_by_alpha</i> &#x2014; material icon named "sort by alpha".</p>
   static const IconData sort_by_alpha = const IconData(0xe053, fontFamily: 'MaterialIcons');
@@ -2527,7 +2527,7 @@ class Icons {
   static const IconData star_border = const IconData(0xe83a, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">star_half</i> &#x2014; material icon named "star half".</p>
-  static const IconData star_half = const IconData(0xe839, fontFamily: 'MaterialIcons');
+  static const IconData star_half = const IconData(0xe839, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">stars</i> &#x2014; material icon named "stars".</p>
   static const IconData stars = const IconData(0xe8d0, fontFamily: 'MaterialIcons');
@@ -2578,7 +2578,7 @@ class Icons {
   static const IconData subdirectory_arrow_right = const IconData(0xe5da, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">subject</i> &#x2014; material icon named "subject".</p>
-  static const IconData subject = const IconData(0xe8d2, fontFamily: 'MaterialIcons');
+  static const IconData subject = const IconData(0xe8d2, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">subscriptions</i> &#x2014; material icon named "subscriptions".</p>
   static const IconData subscriptions = const IconData(0xe064, fontFamily: 'MaterialIcons');
@@ -2728,7 +2728,7 @@ class Icons {
   static const IconData title = const IconData(0xe264, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">toc</i> &#x2014; material icon named "toc".</p>
-  static const IconData toc = const IconData(0xe8de, fontFamily: 'MaterialIcons');
+  static const IconData toc = const IconData(0xe8de, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">today</i> &#x2014; material icon named "today".</p>
   static const IconData today = const IconData(0xe8df, fontFamily: 'MaterialIcons');
@@ -2770,13 +2770,13 @@ class Icons {
   static const IconData translate = const IconData(0xe8e2, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">trending_down</i> &#x2014; material icon named "trending down".</p>
-  static const IconData trending_down = const IconData(0xe8e3, fontFamily: 'MaterialIcons');
+  static const IconData trending_down = const IconData(0xe8e3, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">trending_flat</i> &#x2014; material icon named "trending flat".</p>
-  static const IconData trending_flat = const IconData(0xe8e4, fontFamily: 'MaterialIcons');
+  static const IconData trending_flat = const IconData(0xe8e4, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">trending_up</i> &#x2014; material icon named "trending up".</p>
-  static const IconData trending_up = const IconData(0xe8e5, fontFamily: 'MaterialIcons');
+  static const IconData trending_up = const IconData(0xe8e5, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">trip_origin</i> &#x2014; material icon named "trip origin".</p>
   static const IconData trip_origin = const IconData(0xe57b, fontFamily: 'MaterialIcons');
@@ -2797,7 +2797,7 @@ class Icons {
   static const IconData unarchive = const IconData(0xe169, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">undo</i> &#x2014; material icon named "undo".</p>
-  static const IconData undo = const IconData(0xe166, fontFamily: 'MaterialIcons');
+  static const IconData undo = const IconData(0xe166, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">unfold_less</i> &#x2014; material icon named "unfold less".</p>
   static const IconData unfold_less = const IconData(0xe5d6, fontFamily: 'MaterialIcons');
@@ -2869,13 +2869,13 @@ class Icons {
   static const IconData view_headline = const IconData(0xe8ee, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">view_list</i> &#x2014; material icon named "view list".</p>
-  static const IconData view_list = const IconData(0xe8ef, fontFamily: 'MaterialIcons');
+  static const IconData view_list = const IconData(0xe8ef, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">view_module</i> &#x2014; material icon named "view module".</p>
   static const IconData view_module = const IconData(0xe8f0, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">view_quilt</i> &#x2014; material icon named "view quilt".</p>
-  static const IconData view_quilt = const IconData(0xe8f1, fontFamily: 'MaterialIcons');
+  static const IconData view_quilt = const IconData(0xe8f1, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">view_stream</i> &#x2014; material icon named "view stream".</p>
   static const IconData view_stream = const IconData(0xe8f2, fontFamily: 'MaterialIcons');
@@ -2974,7 +2974,7 @@ class Icons {
   static const IconData work = const IconData(0xe8f9, fontFamily: 'MaterialIcons');
 
   /// <p><i class="material-icons md-36">wrap_text</i> &#x2014; material icon named "wrap text".</p>
-  static const IconData wrap_text = const IconData(0xe25b, fontFamily: 'MaterialIcons');
+  static const IconData wrap_text = const IconData(0xe25b, fontFamily: 'MaterialIcons', matchTextDirection: true);
 
   /// <p><i class="material-icons md-36">youtube_searched_for</i> &#x2014; material icon named "youtube searched for".</p>
   static const IconData youtube_searched_for = const IconData(0xe8fa, fontFamily: 'MaterialIcons');

packages/flutter/lib/src/widgets/icon.dart

@@ -11,7 +11,6 @@ import 'icon_data.dart';
 import 'icon_theme.dart';
 import 'icon_theme_data.dart';
 
-
 /// A graphical icon widget drawn with a glyph from a font described in
 /// an [IconData] such as material's predefined [IconData]s in [Icons].
 ///
@@ -37,6 +36,7 @@ class Icon extends StatelessWidget {
     this.size,
     this.color,
     this.semanticLabel,
+    this.textDirection,
   }) : super(key: key);
 
   /// The icon to display. The available icons are described in [Icons].
@@ -91,14 +91,29 @@ class Icon extends StatelessWidget {
   ///
   /// See also:
   ///
-  ///  * [Semantics.label] which is set with [semanticLabel] in the underlying
+  ///  * [Semantics.label], which is set to [semanticLabel] in the underlying
   ///    [Semantics] widget.
   final String semanticLabel;
 
+  /// The text direction to use for rendering the icon.
+  ///
+  /// If this is null, the ambient [Directionality] is used instead.
+  ///
+  /// Some icons follow the reading direction. For example, "back" buttons point
+  /// left in left-to-right environments and right in right-to-left
+  /// environments. Such icons have their [IconData.matchTextDirection] field
+  /// set to true, and the [Icon] widget uses the [textDirection] to determine
+  /// the orientation in which to draw the icon.
+  ///
+  /// This property has no effect if the [icon]'s [IconData.matchTextDirection]
+  /// field is false, but for consistency a text direction value must always be
+  /// specified, either directly using this property or using [Directionality].
+  final TextDirection textDirection;
+
   @override
   Widget build(BuildContext context) {
-    assert(debugCheckHasDirectionality(context));
-    final TextDirection textDirection = Directionality.of(context);
+    assert(this.textDirection != null || debugCheckHasDirectionality(context));
+    final TextDirection textDirection = this.textDirection ?? Directionality.of(context);
 
     final IconThemeData iconTheme = IconTheme.of(context);
 
@@ -116,6 +131,35 @@ class Icon extends StatelessWidget {
     if (iconOpacity != 1.0)
       iconColor = iconColor.withOpacity(iconColor.opacity * iconOpacity);
 
+    Widget iconWidget = new RichText(
+      textDirection: textDirection, // Since we already fetched it for the assert...
+      text: new TextSpan(
+        text: new String.fromCharCode(icon.codePoint),
+        style: new TextStyle(
+          inherit: false,
+          color: iconColor,
+          fontSize: iconSize,
+          fontFamily: icon.fontFamily,
+          package: icon.fontPackage,
+        ),
+      ),
+    );
+
+    if (icon.matchTextDirection) {
+      switch (textDirection) {
+        case TextDirection.rtl:
+          iconWidget = new Transform(
+            transform: new Matrix4.identity()..scale(-1.0),
+            alignment: Alignment.center,
+            transformHitTests: false,
+            child: iconWidget,
+          );
+          break;
+        case TextDirection.ltr:
+          break;
+      }
+    }
+
     return new Semantics(
       label: semanticLabel,
       child: new ExcludeSemantics(
@@ -123,19 +167,7 @@ class Icon extends StatelessWidget {
           width: iconSize,
           height: iconSize,
           child: new Center(
-            child: new RichText(
-              textDirection: textDirection, // Since we already fetched it for the assert...
-              text: new TextSpan(
-                text: new String.fromCharCode(icon.codePoint),
-                style: new TextStyle(
-                  inherit: false,
-                  color: iconColor,
-                  fontSize: iconSize,
-                  fontFamily: icon.fontFamily,
-                  package: icon.fontPackage,
-                ),
-              ),
-            ),
+            child: iconWidget,
           ),
         ),
       ),

packages/flutter/lib/src/widgets/icon_data.dart

@@ -21,6 +21,7 @@ class IconData {
     this.codePoint, {
     this.fontFamily,
     this.fontPackage,
+    this.matchTextDirection: false,
   });
 
   /// The Unicode code point at which this icon is stored in the icon font.
@@ -39,6 +40,13 @@ class IconData {
   ///  * [TextStyle], which describes how to use fonts from other packages.
   final String fontPackage;
 
+  /// Whether this icon should be automatically mirrored in right-to-left
+  /// environments.
+  ///
+  /// The [Icon] widget respects this value by mirroring the icon when the
+  /// [Directionality] is [TextDirection.rtl].
+  final bool matchTextDirection;
+
   @override
   bool operator ==(dynamic other) {
     if (runtimeType != other.runtimeType)