bugfix bug fixes

Author: shweaver-MSFT

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

@@ -440,7 +440,7 @@ public async Task ClearAsync()
 
         internal async Task AddTokenAsync(object data, bool? atEnd = null)
         {
-            if (ReadLocalValue(MaxTokensProperty) == DependencyProperty.UnsetValue || MaxTokens <= 0)
+            if (ReadLocalValue(MaxTokensProperty) != DependencyProperty.UnsetValue && MaxTokens <= 0)
             {
                 // No tokens for you
                 return;
@@ -465,7 +465,7 @@ internal async Task AddTokenAsync(object data, bool? atEnd = null)
             // If we've been typing in the last box, just add this to the end of our collection
             if (atEnd == true || _currentTextEdit == _lastTextEdit)
             {
-                if (ReadLocalValue(MaxTokensProperty) != DependencyProperty.UnsetValue && _innerItemsSource.ItemsSource.Count > MaxTokens)
+                if (ReadLocalValue(MaxTokensProperty) != DependencyProperty.UnsetValue && _innerItemsSource.ItemsSource.Count >= MaxTokens)
                 {
                     // Remove tokens from the end until below the max number.
                     for (var i = _innerItemsSource.Count - 2; i >= 0; --i)
@@ -493,7 +493,7 @@ internal async Task AddTokenAsync(object data, bool? atEnd = null)
                 var edit = _currentTextEdit;
                 var index = _innerItemsSource.IndexOf(edit);
 
-                if (ReadLocalValue(MaxTokensProperty) != DependencyProperty.UnsetValue && _innerItemsSource.ItemsSource.Count > MaxTokens)
+                if (ReadLocalValue(MaxTokensProperty) != DependencyProperty.UnsetValue && _innerItemsSource.ItemsSource.Count >= MaxTokens)
                 {
                     // Find the next token and remove it, until below the max number of tokens.
                     for (var i = index; i < _innerItemsSource.Count;  i++)