Fix `IconTheme` is not inherited when `Icon` is provided to `ListTile.title`...

Fix `IconTheme` is not inherited when `Icon` is provided to `ListTile.title` and `ListTile.subtitle` (#100757)

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

@@ -694,11 +694,10 @@ class ListTile extends StatelessWidget {
     assert(debugCheckHasMaterial(context));
     final ThemeData theme = Theme.of(context);
     final ListTileThemeData tileTheme = ListTileTheme.of(context);
+    final IconThemeData iconThemeData = IconThemeData(color: _iconColor(theme, tileTheme));
 
-    IconThemeData? iconThemeData;
     TextStyle? leadingAndTrailingTextStyle;
     if (leading != null || trailing != null) {
-      iconThemeData = IconThemeData(color: _iconColor(theme, tileTheme));
       leadingAndTrailingTextStyle = _trailingAndLeadingTextStyle(theme, tileTheme);
     }
 
@@ -707,10 +706,7 @@ class ListTile extends StatelessWidget {
       leadingIcon = AnimatedDefaultTextStyle(
         style: leadingAndTrailingTextStyle!,
         duration: kThemeChangeDuration,
-        child: IconTheme.merge(
-          data: iconThemeData!,
         child: leading!,
-        ),
       );
     }
 
@@ -737,10 +733,7 @@ class ListTile extends StatelessWidget {
       trailingIcon = AnimatedDefaultTextStyle(
         style: leadingAndTrailingTextStyle!,
         duration: kThemeChangeDuration,
-        child: IconTheme.merge(
-          data: iconThemeData!,
         child: trailing!,
-        ),
       );
     }
 
@@ -782,6 +775,8 @@ class ListTile extends StatelessWidget {
             top: false,
             bottom: false,
             minimum: resolvedContentPadding,
+            child: IconTheme.merge(
+              data: iconThemeData,
               child: _ListTile(
                 leading: leadingIcon,
                 title: titleText,
@@ -800,6 +795,7 @@ class ListTile extends StatelessWidget {
             ),
           ),
         ),
+      ),
     );
   }
 }

packages/flutter/test/material/list_tile_test.dart

@@ -2085,6 +2085,8 @@ void main() {
     const ColorScheme lightColorScheme = ColorScheme.light();
     const ColorScheme darkColorScheme = ColorScheme.dark();
     final Key leadingKey = UniqueKey();
+    final Key titleKey = UniqueKey();
+    final Key subtitleKey = UniqueKey();
     final Key trailingKey = UniqueKey();
 
     Widget buildFrame({ required Brightness brightness, required bool selected }) {
@@ -2098,6 +2100,8 @@ void main() {
             child: ListTile(
               selected: selected,
               leading: TestIcon(key: leadingKey),
+              title: TestIcon(key: titleKey),
+              subtitle: TestIcon(key: subtitleKey),
               trailing: TestIcon(key: trailingKey),
             ),
           ),
@@ -2109,21 +2113,29 @@ void main() {
 
     await tester.pumpWidget(buildFrame(brightness: Brightness.light, selected: true));
     expect(iconColor(leadingKey), lightColorScheme.primary);
+    expect(iconColor(titleKey), lightColorScheme.primary);
+    expect(iconColor(subtitleKey), lightColorScheme.primary);
     expect(iconColor(trailingKey), lightColorScheme.primary);
 
     await tester.pumpWidget(buildFrame(brightness: Brightness.light, selected: false));
     expect(iconColor(leadingKey), Colors.black45);
+    expect(iconColor(titleKey), Colors.black45);
+    expect(iconColor(subtitleKey), Colors.black45);
     expect(iconColor(trailingKey), Colors.black45);
 
     await tester.pumpWidget(buildFrame(brightness: Brightness.dark, selected: true));
     await tester.pumpAndSettle(); // Animated theme change
     expect(iconColor(leadingKey), darkColorScheme.primary);
+    expect(iconColor(titleKey), darkColorScheme.primary);
+    expect(iconColor(subtitleKey), darkColorScheme.primary);
     expect(iconColor(trailingKey), darkColorScheme.primary);
 
     // For this configuration, ListTile defers to the default IconTheme.
     // The default dark theme's IconTheme has color:white
     await tester.pumpWidget(buildFrame(brightness: Brightness.dark, selected: false));
     expect(iconColor(leadingKey),  Colors.white);
+    expect(iconColor(titleKey),  Colors.white);
+    expect(iconColor(subtitleKey),  Colors.white);
     expect(iconColor(trailingKey), Colors.white);
   });
 }