RTL caret in text fields (#33461)

bin/flutter

@@ -173,7 +173,7 @@ if [[ ! -e "$FLUTTER_ROOT/.git" ]]; then
 fi
 
 # To debug the tool, you can uncomment the following lines to enable checked mode and set an observatory port:
-# FLUTTER_TOOL_ARGS="--checked $FLUTTER_TOOL_ARGS"
+# FLUTTER_TOOL_ARGS="--enable-asserts $FLUTTER_TOOL_ARGS"
 # FLUTTER_TOOL_ARGS="$FLUTTER_TOOL_ARGS --observe=65432"
 
 (upgrade_flutter) 3< "$PROG_NAME"

dev/snippets/test/snippets_test.dart

@@ -19,7 +19,7 @@ void main() {
     File template;
 
     setUp(() {
-      tmpDir = Directory.systemTemp.createTempSync('snippets_test');
+      tmpDir = Directory.systemTemp.createTempSync('flutter_snippets_test.');
       configuration = Configuration(flutterRoot: Directory(path.join(
           tmpDir.absolute.path, 'flutter')));
       configuration.createOutputDirectory();

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

@@ -104,6 +104,7 @@ abstract class ScrollMetrics {
   ///
   /// The value is always non-negative, and less than or equal to [viewportDimension].
   double get extentInside {
+    assert(minScrollExtent <= maxScrollExtent);
     return viewportDimension
       // "above" overscroll value
       - (minScrollExtent - pixels).clamp(0, viewportDimension)

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

@@ -447,6 +447,8 @@ abstract class ScrollPosition extends ViewportOffset with ScrollMetrics {
 
   @override
   bool applyContentDimensions(double minScrollExtent, double maxScrollExtent) {
+    assert(minScrollExtent != null);
+    assert(maxScrollExtent != null);
     if (!nearEqual(_minScrollExtent, minScrollExtent, Tolerance.defaultTolerance.distance) ||
         !nearEqual(_maxScrollExtent, maxScrollExtent, Tolerance.defaultTolerance.distance) ||
         _didChangeViewportDimensionOrReceiveCorrection) {