Remove ConfigureAwait(false) from system dialog classes (#118)

Author: Copilot

src/Modern.Forms/Application.cs

@@ -72,6 +72,8 @@ public static void Exit ()
         /// <param name="mainForm">A Form that represents the form to make visible.</param>
         public static void Run (Form mainForm)
         {
+            AvaloniaSynchronizationContext.InstallIfNeeded ();
+
             mainForm.Show ();
             Run ((ICloseable)mainForm);
         }
@@ -85,6 +87,7 @@ public static void Run (ICloseable closable)
             if (_mainLoopCancellationTokenSource != null)
                 throw new InvalidOperationException ("Run should only be called once");
 
+            AvaloniaSynchronizationContext.InstallIfNeeded ();
             closable.Closed += (s, e) => Exit ();
 
             _mainLoopCancellationTokenSource = new CancellationTokenSource ();

src/Modern.Forms/FolderBrowserDialog.cs

@@ -25,7 +25,7 @@ public async Task<DialogResult> ShowDialog (Form owner)
                     Title = Title
                 };
 
-                var result = await parent.OpenFolderPickerAsync (options).ConfigureAwait (false);
+                var result = await parent.OpenFolderPickerAsync (options);
 
                 var paths = result.Select (f => f.GetFullPath ()).WhereNotNull ();
 

src/Modern.Forms/OpenFileDialog.cs

@@ -26,7 +26,7 @@ public async Task<DialogResult> ShowDialog (Form owner)
                     FileTypeFilter = filters
                 };
 
-                var result = await parent.OpenFilePickerAsync (options).ConfigureAwait (false);
+                var result = await parent.OpenFilePickerAsync (options);
 
                 FileNames.Clear ();
 

src/Modern.Forms/SaveFileDialog.cs

@@ -27,7 +27,7 @@ public async Task<DialogResult> ShowDialog (Form owner)
                     FileTypeChoices = filters
                 };
 
-                var result = await parent.SaveFilePickerAsync (options).ConfigureAwait (false);
+                var result = await parent.SaveFilePickerAsync (options);
 
                 FileNames.Clear ();