[PT Run] Resolve text alignment issues for RTL input languages (not for mixed strings) (#5170)

* Added logic to switch TextBox/TextBlock flow direction on language change

* Move event handler to separate method

* Moved code to function

src/modules/launcher/PowerLauncher/LauncherControl.xaml

@@ -80,7 +80,7 @@
             x:FieldModifier="public"
             Opacity="0.6"            
             Canvas.ZIndex="0"
-            Margin="24, 0, 0, 0"
+            Margin="24, 0, 14, 0"
             VerticalAlignment="Center"
             FontSize="24"
             Foreground="{DynamicResource TextControlPlaceholderForeground}"

src/modules/launcher/PowerLauncher/MainWindow.xaml.cs

@@ -83,6 +83,13 @@ namespace PowerLauncher
             SearchBox.QueryTextBox.DataContext = _viewModel;
             SearchBox.QueryTextBox.PreviewKeyDown += _launcher_KeyDown;
             SearchBox.QueryTextBox.TextChanged += QueryTextBox_TextChanged;
+
+            // Set initial language flow direction
+            SearchBox_UpdateFlowDirection();
+
+            // Register language changed event
+            InputLanguageManager.Current.InputLanguageChanged += SearchBox_InputLanguageChanged;
+
             SearchBox.QueryTextBox.Focus();
 
             ListBox.DataContext = _viewModel;
@@ -395,6 +402,17 @@ namespace PowerLauncher
             Hide();
         }
 
+        private void SearchBox_UpdateFlowDirection()
+        {
+            SearchBox.QueryTextBox.FlowDirection = MainViewModel.GetLanguageFlowDirection();
+            SearchBox.AutoCompleteTextBlock.FlowDirection = MainViewModel.GetLanguageFlowDirection();
+        }
+
+        private void SearchBox_InputLanguageChanged(object sender, InputLanguageEventArgs e) 
+        {
+            SearchBox_UpdateFlowDirection();
+        }
+
         protected virtual void Dispose(bool disposing)
         {
             if (!disposedValue)

src/modules/launcher/PowerLauncher/ViewModel/MainViewModel.cs

@@ -273,7 +273,6 @@ namespace PowerLauncher.ViewModel
 
         public string QueryText { get; set; } = String.Empty;
 
-
         /// <summary>
         /// we need move cursor to end when we manually changed query
         /// but we don't want to move cursor to end when query is updated from TextBox. 
@@ -794,6 +793,20 @@ namespace PowerLauncher.ViewModel
             return string.Empty;
         }
 
+        public static FlowDirection GetLanguageFlowDirection()
+        {
+            bool isCurrentLanguageRightToLeft = System.Windows.Input.InputLanguageManager.Current.CurrentInputLanguage.TextInfo.IsRightToLeft;
+
+            if (isCurrentLanguageRightToLeft)
+            {
+                return FlowDirection.RightToLeft;
+            }
+            else
+            {
+                return FlowDirection.LeftToRight;
+            }
+        }
+
         protected virtual void Dispose(bool disposing)
         {
             if (!_disposed)