Fix: Clear search text on load to handle Revit shortcut bleed-through

Reverted the focus change to keep tbxSearch focused by default as requested.
Added a Loaded event handler to clear SearchText using DispatcherPriority.ContextIdle, which ensures any characters from multi-key Revit shortcuts (like 'AA') are cleared while maintaining the default search focus.

Fixes #76

Co-authored-by: chuongmep <31106432+chuongmep@users.noreply.github.com>

Author: google-labs-jules[bot]

AddInManager/View/FrmAddInManager.xaml

@@ -17,12 +17,13 @@
     d:DesignHeight="600"
     d:DesignWidth="400"
     Closed="OnCloseApp"
-    FocusManager.FocusedElement="{Binding ElementName=TabControl}"
+    FocusManager.FocusedElement="{Binding ElementName=tbxSearch}"
     Icon="../Resources/dev.ico"
     Left="{model:SettingBinding AppLeft}"
     PreviewKeyDown="CloseFormEvent"
     SizeChanged="FrmSizeChanged"
     Top="{model:SettingBinding AppTop}"
+    Loaded="FrmAddInManager_OnLoaded"
     mc:Ignorable="d">
     <Window.Resources>
         <ResourceDictionary>

AddInManager/View/FrmAddInManager.xaml.cs

@@ -24,6 +24,17 @@ public FrmAddInManager(AddInManagerViewModel vm)
         Title += DefaultSetting.Version;
     }
 
+    private void FrmAddInManager_OnLoaded(object sender, RoutedEventArgs e)
+    {
+        // GitHub Issue: https://github.com/chuongmep/RevitAddInManager/issues/76
+        // When user use keyboard shortcut like "AA" to open AddInManager, the second "A" will be entered into tbxSearch
+        // We clear the search text after the window is fully loaded and idle.
+        Dispatcher.BeginInvoke(new Action(() =>
+        {
+            viewModel.SearchText = string.Empty;
+        }), DispatcherPriority.ContextIdle);
+    }
+
     private void TbxDescription_OnLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
     {
         if (viewModel.MAddinManagerBase.ActiveCmdItem != null && TabControl.SelectedIndex == 0)