CQ: Add FlowDirectionChanged event

Author: XTorLukas

src/Files.App/Data/Contracts/IRealTimeLayoutService.cs

@@ -11,6 +11,11 @@ namespace Files.App.Data.Contracts
 	/// </summary>
 	public interface IRealTimeLayoutService
 	{
+		/// <summary>
+		/// Occurs when the flow direction of the layout changes.
+		/// </summary>
+		public event EventHandler<FlowDirection>? FlowDirectionChanged;
+
 		/// <summary>
 		/// Gets the current flow direction for layout (e.g., LeftToRight or RightToLeft).
 		/// </summary>

src/Files.App/Services/Content/RealTimeLayoutService.cs

@@ -21,6 +21,9 @@ internal sealed class RealTimeLayoutService : IRealTimeLayoutService
 		/// </summary>
 		private readonly List<(WeakReference<object> Reference, Action Callback)> _callbacks = [];
 
+		/// <inheritdoc/>
+		public event EventHandler<FlowDirection>? FlowDirectionChanged;
+
 		/// <inheritdoc/>
 		public FlowDirection FlowDirection => CultureInfo.CurrentUICulture.TextInfo.IsRightToLeft ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
 
@@ -122,6 +125,8 @@ private void InvokeCallbacks()
 				item.Reference.TryGetTarget(out var targetObject) && targetObject != null)
 				.Select(item => item.Callback).ForEach(callback => callback());
 			_callbacks.RemoveAll(item => !item.Reference.TryGetTarget(out _));
+
+			FlowDirectionChanged?.Invoke(this, FlowDirection);
 		}
 	}
 }