Fix manually tested issue where initial character press of overwriting token wasn't being set to box (aggressive if)

Also realized we would no longer raise the text changed event in that scenario, so changed logic for text changed event.
We'll need to create integration tests for these keyboard driven scenarios in the new test setup from Labs (when it's finished) in 8.0. These would make good keyboard driver tests.

Author: michael-hawker

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

@@ -101,31 +101,36 @@ private void OnApplyTemplateAutoSuggestBox(AutoSuggestBox auto)
                 _autoSuggestBox.LostFocus += AutoSuggestBox_LostFocus;
 
                 // Setup a binding to the QueryIcon of the Parent if we're the last box.
-                if (Content is ITokenStringContainer str && str.IsLast)
+                if (Content is ITokenStringContainer str)
                 {
-                    // Workaround for https://github.com/microsoft/microsoft-ui-xaml/issues/2568
-                    if (Owner.QueryIcon is FontIconSource fis &&
-                        fis.ReadLocalValue(FontIconSource.FontSizeProperty) == DependencyProperty.UnsetValue)
-                    {
-                        // This can be expensive, could we optimize?
-                        // Also, this is changing the FontSize on the IconSource (which could be shared?)
-                        fis.FontSize = Owner.TryFindResource("TokenizingTextBoxIconFontSize") as double? ?? 16;
-                    }
+                    // We need to set our initial text in all cases.
+                    _autoSuggestBox.Text = str.Text;
 
-                    var iconBinding = new Binding()
+                    // We only set/bind some properties on the last textbox to mimic the autosuggestbox look
+                    if (str.IsLast)
                     {
-                        Source = Owner,
-                        Path = new PropertyPath(nameof(Owner.QueryIcon)),
-                        RelativeSource = new RelativeSource() { Mode = RelativeSourceMode.TemplatedParent }
-                    };
+                        // Workaround for https://github.com/microsoft/microsoft-ui-xaml/issues/2568
+                        if (Owner.QueryIcon is FontIconSource fis &&
+                            fis.ReadLocalValue(FontIconSource.FontSizeProperty) == DependencyProperty.UnsetValue)
+                        {
+                            // This can be expensive, could we optimize?
+                            // Also, this is changing the FontSize on the IconSource (which could be shared?)
+                            fis.FontSize = Owner.TryFindResource("TokenizingTextBoxIconFontSize") as double? ?? 16;
+                        }
 
-                    var iconSourceElement = new IconSourceElement();
+                        var iconBinding = new Binding()
+                        {
+                            Source = Owner,
+                            Path = new PropertyPath(nameof(Owner.QueryIcon)),
+                            RelativeSource = new RelativeSource() { Mode = RelativeSourceMode.TemplatedParent }
+                        };
 
-                    iconSourceElement.SetBinding(IconSourceElement.IconSourceProperty, iconBinding);
+                        var iconSourceElement = new IconSourceElement();
 
-                    _autoSuggestBox.QueryIcon = iconSourceElement;
+                        iconSourceElement.SetBinding(IconSourceElement.IconSourceProperty, iconBinding);
 
-                    _autoSuggestBox.Text = str.Text;
+                        _autoSuggestBox.QueryIcon = iconSourceElement;
+                    }
                 }
             }
         }
@@ -184,19 +189,11 @@ void WaitForLoad(object s, RoutedEventArgs eargs)
 
         private void AutoSuggestBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
         {
-            var hasDelimiter = !string.IsNullOrEmpty(Owner.TokenDelimiter) && sender.Text?.Contains(Owner.TokenDelimiter) == true;
-
-            // Ignore in the case we've been set from the parent and already equal the owning text,
-            // unless we contain our delimiter.
-            if (!hasDelimiter && EqualityComparer<string>.Default.Equals(sender.Text, Owner.Text))
+            if (!EqualityComparer<string>.Default.Equals(sender.Text, Owner.Text))
             {
-                return;
+                Owner.Text = sender.Text; // Update parent text property, if different
             }
 
-            var t = sender.Text.Trim();
-
-            Owner.Text = sender.Text; // Update parent text property
-
             // Override our programmatic manipulation as we're redirecting input for the user
             if (UseCharacterAsUser)
             {
@@ -207,8 +204,10 @@ private void AutoSuggestBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTex
 
             Owner.RaiseTextChanged(sender, args);
 
+            var t = sender.Text?.Trim() ?? string.Empty;
+
             // Look for Token Delimiters to create new tokens when text changes.
-            if (hasDelimiter)
+            if (!string.IsNullOrEmpty(Owner.TokenDelimiter) && t.Contains(Owner.TokenDelimiter))
             {
                 bool lastDelimited = t[t.Length - 1] == Owner.TokenDelimiter[0];