Merge branch 'master' into feature/flowDirectionImpl

samples/ControlCatalog/Pages/ScreenPage.cs

@@ -78,5 +78,7 @@ namespace ControlCatalog.Pages
             return new FormattedText(textToFormat, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
                 Typeface.Default, 12, Brushes.Green);
         }
+
+        protected override bool ShouldBeMirroredIfRightToLeft() => false;
     }
 }

src/Avalonia.Controls/Control.cs

@@ -346,7 +346,7 @@ namespace Avalonia.Controls
             if (shouldBeMirroredIfRightToLeft)
             {
                 shouldMirror = ShuoldApplyMirrorTransform(parentFD, thisFD);
-                if (this is PopupRoot && thisFD == FlowDirection.RightToLeft)
+                if (Parent is Popup && thisFD == FlowDirection.RightToLeft)
                 {
                     shouldMirror = true;
                 }