undo textDirection change

Author: LongCatIsLooong

lib/web_ui/lib/src/engine/text/layout_fragmenter.dart

@@ -114,7 +114,7 @@ abstract class _CombinedFragment extends TextFragment {
 
   final LineBreakType type;
 
-  ui.TextDirection get textDirection => _textDirection!;
+  ui.TextDirection? get textDirection => _textDirection;
   ui.TextDirection? _textDirection;
 
   final FragmentFlow fragmentFlow;
@@ -365,7 +365,7 @@ mixin _FragmentBox on _CombinedFragment, _FragmentMetrics, _FragmentPosition {
     top,
     line.left + right,
     bottom,
-    textDirection,
+    textDirection!,
   );
 
   /// Whether or not the trailing spaces of this fragment are part of trailing
@@ -388,14 +388,14 @@ mixin _FragmentBox on _CombinedFragment, _FragmentMetrics, _FragmentPosition {
               top,
               line.left + right - widthOfTrailingSpaces,
               bottom,
-              textDirection,
+              textDirection!,
             )
           : ui.TextBox.fromLTRBD(
               line.left + left + widthOfTrailingSpaces,
               top,
               line.left + right,
               bottom,
-              textDirection,
+              textDirection!,
             );
     }
     return _textBoxIncludingTrailingSpaces;
@@ -488,7 +488,7 @@ mixin _FragmentBox on _CombinedFragment, _FragmentMetrics, _FragmentPosition {
       top,
       line.left + right,
       bottom,
-      textDirection,
+      textDirection!,
     );
   }
 

lib/web_ui/lib/src/engine/text/layout_service.dart

@@ -296,7 +296,7 @@ class TextLayoutService {
       sandwichStart = null;
 
       if (i < line.fragments.length){
-        previousDirection = line.fragments[i].textDirection;
+        previousDirection = line.fragments[i].textDirection!;
       }
     }
   }
@@ -429,7 +429,7 @@ class TextLayoutService {
     final bool closestGraphemeStartInFragment = !fragment.hasLeadingBrokenGrapheme
                                              || dx <= fragment.line.left
                                              || fragment.line.left + fragment.line.width <= dx
-                                             || switch (fragment.textDirection) {
+                                             || switch (fragment.textDirection!) {
                                                // If dx is closer to the trailing edge, no need to check other fragments.
                                                ui.TextDirection.ltr => dx >= (fragment.left + fragment.right) / 2,
                                                ui.TextDirection.rtl => dx <= (fragment.left + fragment.right) / 2,
@@ -438,7 +438,7 @@ class TextLayoutService {
     if (closestGraphemeStartInFragment) {
       return candidate1;
     }
-    final bool searchLeft = switch (fragment.textDirection) {
+    final bool searchLeft = switch (fragment.textDirection!) {
       ui.TextDirection.ltr => true,
       ui.TextDirection.rtl => false,
     };

lib/web_ui/lib/src/engine/text/paint_service.dart

@@ -67,7 +67,7 @@ class TextPaintService {
     }
 
     _prepareCanvasForFragment(canvas, fragment);
-    final double fragmentX = fragment.textDirection == ui.TextDirection.ltr
+    final double fragmentX = fragment.textDirection! == ui.TextDirection.ltr
         ? fragment.left
         : fragment.right;
 
@@ -96,7 +96,7 @@ class TextPaintService {
       }
     }
 
-    canvas.setCssFont(style.cssFontString, fragment.textDirection);
+    canvas.setCssFont(style.cssFontString, fragment.textDirection!);
     canvas.setUpPaint(paint.paintData, null);
   }
 }