RichTextBox: Text is not deleted on first backspace key press when track changes is enabled

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Last Updated: 10 Feb 2025 13:10 by Martin Ivanov

Martin Ivanov

Created on: 10 Feb 2025 13:10

Category: RichTextBox

Type: Bug Report

RichTextBox: Text is not deleted on first backspace key press when track changes is enabled

The issue reproduces when track changes is enabled and new text is entered. After waiting some time and pressing the Backspace on the keyboard in order to delete a character, nothing happens. You should press the Backspace a second time in order to make the deletion work. After that you can delete the content normally.

The waiting time before pressing the Backspace is usually until the next minute of the clock comes. For example, you can write something at 14:55 and wait until 14:56. Then, press Backspace.

If you check the Output pane of Visual Studio you will see the following assertion failure message printed:

---- DEBUG ASSERTION FAILED ----
at Telerik.Windows.Documents.Model.RadDocumentEditor.DeleteTrackChanges(Boolean deletePrevious) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\Model\RadDocumentEditor_Editing.cs:line 693
at Telerik.Windows.Documents.Model.RadDocumentEditor.Delete(Boolean deletePrevious) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\Model\RadDocumentEditor_Editing.cs:line 85
at Telerik.Windows.Controls.RadRichTextBox.Telerik.Windows.Documents.Model.IDocumentEditor.Delete(Boolean deletePrevious) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\UI\RadRichTextBox.cs:line 4890
at Telerik.Windows.Controls.RadRichTextBox.Delete(Boolean deletePrevious) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\UI\RadRichTextBox.cs:line 4866
at Telerik.Windows.Documents.RichTextBoxCommands.DeleteCommand.ExecuteOverride(Object parameter) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\DeleteCommand.cs:line 57
at Telerik.Windows.Documents.RichTextBoxCommands.RichTextBoxCommandBase.Execute(Object parameter, Boolean focusCaret) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\RichTextBoxCommandBase.cs:line 316
at Telerik.Windows.Documents.RichTextBoxCommands.RichTextBoxCommandBase.Execute(Object parameter) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\RichTextBoxCommandBase.cs:line 285
at Telerik.Windows.Documents.RichTextBoxCommands.RichTextBoxRoutedCommand.Execute(Object parameter, RadRichTextBox radRichTextBox) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\RoutedCommands\RichTextBoxRoutedCommand.cs:line 57
at Telerik.Windows.Documents.RichTextBoxCommands.RichTextBoxRoutedCommand.CommandBindingHelper.CommandBinding_Executed(Object sender, ExecutedRoutedEventArgs e) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\RoutedCommands\RichTextBoxRoutedCommand.cs:line 17
at System.Windows.Input.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
at System.Windows.Input.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
at System.Windows.Input.CommandManager.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
at System.Windows.UIElement.OnExecutedThunk(Object sender, ExecutedRoutedEventArgs e)
at System.Windows.Input.ExecutedRoutedEventArgs.InvokeEventHandler(Delegate genericHandler, Object target)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.RoutedCommand.ExecuteImpl(Object parameter, IInputElement target, Boolean userInitiated)
at System.Windows.Input.RoutedCommand.Execute(Object parameter, IInputElement target)
at System.Windows.Input.RoutedCommand.System.Windows.Input.ICommand.Execute(Object parameter)
at Telerik.Windows.Documents.UI.Extensibility.DefaultInputHandler.HandleInput(RadRichTextBox richTextBox, PreviewEditorKeyEventArgs e) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\RichTextBoxCommands\RoutedCommands\DefaultInputHandler.cs:line 54
at Telerik.Windows.Controls.RadRichTextBox.HandlePresenterKeyDown(PreviewEditorKeyEventArgs e) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\UI\RadRichTextBox.cs:line 4612
at Telerik.Windows.Documents.UI.DocumentPresenterBase.HandleKeyDown(KeyEventArgs e) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\UI\DocumentPresenterBase.cs:line 859
at Telerik.Windows.Documents.UI.DocumentPresenterBase.OnPreviewKeyDown(KeyEventArgs e) in C:\PersonalFiles\Git\wpf\Controls\RichTextBox\Core\UI\DocumentPresenterBase.cs:line 805

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