feat: improve accessibility.

src/Ursa.Themes.Semi/Controls/MultiAutoCompleteBox.axaml

@@ -37,7 +37,7 @@
                                     <ItemsPanelTemplate>
                                         <u:WrapPanelWithTrailingItem>
                                             <u:WrapPanelWithTrailingItem.TrailingItem>
-                                                <TextBox VerticalAlignment="Center" Theme="{DynamicResource TagInputTextBoxTheme}"/>
+                                                <TextBox VerticalAlignment="Center" MinWidth="24" Theme="{DynamicResource TagInputTextBoxTheme}"/>
                                             </u:WrapPanelWithTrailingItem.TrailingItem>
                                         </u:WrapPanelWithTrailingItem>
                                     </ItemsPanelTemplate>

src/Ursa/Controls/AutoCompleteBox/MultiAutoCompleteBox.cs

@@ -637,6 +637,11 @@ public partial class MultiAutoCompleteBox : TemplatedControl, IInnerContentContr
             if (e.Key == Key.Down
                 && !this.IsAllowedXYNavigationMode(e.KeyDeviceType))
             {
+                if (string.IsNullOrEmpty(TextBox?.Text))
+                {
+                    UpdateTextValue(string.Empty, true);
+                }
+                RefreshView();
                 SetCurrentValue(IsDropDownOpenProperty, true);
                 e.Handled = true;
             }
@@ -1101,7 +1106,7 @@ public partial class MultiAutoCompleteBox : TemplatedControl, IInnerContentContr
     {
         if (_popupHasOpened)
         {
-            if (SelectionAdapter != null) SelectionAdapter.SelectedItem = null;
+            // if (SelectionAdapter != null) SelectionAdapter.SelectedItem = null;
             if (DropDownPopup != null) DropDownPopup.IsOpen = false;
             OnDropDownClosed(System.EventArgs.Empty);
         }
@@ -1564,7 +1569,10 @@ public partial class MultiAutoCompleteBox : TemplatedControl, IInnerContentContr
     /// <param name="e">The selection changed event data.</param>
     private void OnAdapterSelectionChanged(object? sender, SelectionChangedEventArgs e)
     {
-        SelectedItems?.Add(_adapter?.SelectedItem);
+        if (_valueBindingEvaluator is null) return;
+        UpdateTextValue(_valueBindingEvaluator?.GetDynamicValue(_adapter?.SelectedItem), false);
+        // SelectedItems?.Add(_adapter?.SelectedItem);
+
     }
 
     //TODO Check UpdateTextCompletion
@@ -1579,6 +1587,7 @@ public partial class MultiAutoCompleteBox : TemplatedControl, IInnerContentContr
 
         // Completion will update the selected value
         //UpdateTextCompletion(false);
+        SelectedItems?.Add(_adapter?.SelectedItem);
         UpdateTextValue(string.Empty, false);
         
         // Text should not be selected

src/Ursa/Controls/AutoCompleteBox/MultiAutoCompleteSelectionAdapter.cs

@@ -1,4 +1,5 @@
 using System.Collections;
+using System.Diagnostics;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Primitives;
@@ -16,9 +17,6 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
     /// </summary>
     private SelectingItemsControl? _selector;
 
-    private object? _previewSelectedItem;
-    private object? _selectedItem;
-
     /// <summary>
     ///     Initializes a new instance of the
     ///     <see cref="T:Avalonia.Controls.Utils.SelectingItemsControlSelectionAdapter" />
@@ -110,14 +108,13 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
     /// <value>The selected item of the underlying selection adapter.</value>
     public object? SelectedItem
     {
-        get => _selectedItem;
+        get => SelectorControl?.SelectedItem;
 
         set
         {
             IgnoringSelectionChanged = true;
             if (SelectorControl != null)
             {
-                _selectedItem = value;
                 SelectorControl.SelectedItem = value;
             }
             // Attempt to reset the scroll viewer's position
@@ -215,7 +212,9 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
     private void OnSelectionChanged(object? sender, SelectionChangedEventArgs e)
     {
         if (IgnoringSelectionChanged) return;
-        _previewSelectedItem = SelectorControl?.SelectedItem;
+        // SelectedItem = SelectorControl?.SelectedItem;
+        SelectionChanged?.Invoke(this, e);
+        // _previewSelectedItem = SelectorControl?.SelectedItem;
     }
 
     /// <summary>
@@ -258,6 +257,7 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
     /// </summary>
     internal void OnCommit()
     {
+        /*
         if (_previewSelectedItem is null) return;
         SelectedItem = _previewSelectedItem;
         SelectionChanged?.Invoke(this,
@@ -267,6 +267,7 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
                 new List<object?> { SelectedItem }
             )
         );
+        */
         Commit?.Invoke(this, new RoutedEventArgs());
         AfterAdapterAction();
     }
@@ -292,7 +293,6 @@ public class MultiAutoCompleteSelectionAdapter : ISelectionAdapter
         {
             SelectorControl.SelectedItem = null;
             SelectorControl.SelectedIndex = -1;
-            _previewSelectedItem = null;
         }
         IgnoringSelectionChanged = false;
     }