[TokenizingTextBox] Keep text after a query is submitted

Microsoft.Toolkit.Uwp.UI.Controls.Input/TokenizingTextBox/TokenizingTextBox.Properties.cs

@@ -116,6 +116,16 @@ private static void TextPropertyChanged(DependencyObject d, DependencyPropertyCh
             }
         }
 
+        /// <summary>
+        /// Identifies the <see cref="KeepTextAfterQuerySubmitted"/> property.
+        /// </summary>
+        public static readonly DependencyProperty KeepTextAfterQuerySubmittedProperty = DependencyProperty.Register(
+            nameof(KeepTextAfterQuerySubmitted),
+            typeof(bool),
+            typeof(TokenizingTextBox),
+            new PropertyMetadata(false));
+
+
         /// <summary>
         /// Identifies the <see cref="SuggestedItemsSource"/> property.
         /// </summary>
@@ -282,6 +292,16 @@ public string Text
             set => SetValue(TextProperty, value);
         }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether the control should keep or clear the text
+        /// after the query is submitted. Default is false (to clear the text).
+        /// </summary>
+        public bool KeepTextAfterQuerySubmitted
+        {
+            get => (bool)GetValue(KeepTextAfterQuerySubmittedProperty);
+            set => SetValue(KeepTextAfterQuerySubmittedProperty, value);
+        }
+
         /// <summary>
         /// Gets or sets the items source for token suggestions.
         /// </summary>

Microsoft.Toolkit.Uwp.UI.Controls.Input/TokenizingTextBox/TokenizingTextBoxItem.AutoSuggestBox.cs

@@ -153,8 +153,12 @@ private async void AutoSuggestBox_QuerySubmitted(AutoSuggestBox sender, AutoSugg
             if (chosenItem != null)
             {
                 await Owner.AddTokenAsync(chosenItem); // TODO: Need to pass index?
-                sender.Text = string.Empty;
-                Owner.Text = string.Empty;
+                if (!Owner.KeepTextAfterQuerySubmitted)
+                {
+                    sender.Text = string.Empty;
+                    Owner.Text = string.Empty;
+                }
+
                 sender.Focus(FocusState.Programmatic);
             }
         }