Fix Rtl leading alignment problem (singerdmx#1222)

Author: doonfrs

lib/src/widgets/raw_editor.dart

@@ -891,7 +891,7 @@ class RawEditorState extends EditorState
         final editableTextBlock = EditableTextBlock(
             block: node,
             controller: controller,
-            textDirection: _textDirection,
+            textDirection: getDirectionOfNode(node),
             scrollBottomInset: widget.scrollBottomInset,
             verticalSpacing: _getVerticalSpacingForBlock(node, _styles),
             textSelection: controller.selection,

lib/src/widgets/text_line.dart

@@ -1082,9 +1082,16 @@ class RenderEditableTextLine extends RenderEditableBox {
   @override
   void paint(PaintingContext context, Offset offset) {
     if (_leading != null) {
-      final parentData = _leading!.parentData as BoxParentData;
-      final effectiveOffset = offset + parentData.offset;
-      context.paintChild(_leading!, effectiveOffset);
+      if (textDirection == TextDirection.ltr) {
+        final parentData = _leading!.parentData as BoxParentData;
+        final effectiveOffset = offset + parentData.offset;
+        context.paintChild(_leading!, effectiveOffset);
+      } else {
+        final parentData = _leading!.parentData as BoxParentData;
+        final effectiveOffset = offset + parentData.offset;
+        context.paintChild(_leading!,
+            Offset(size.width - _leading!.size.width, effectiveOffset.dy));
+      }
     }
 
     if (_body != null) {