ArgumentOutOfRangeException TextBlock

I wasn’t able to repro it, but sometimes the start parameter is bigger than the length of the actual string, causing this exception. @Gillibald Any idea why this is happening? Thanks

Update Seems like it happens only with Segoe UI font (maybe due to it taking more space than default?) Repro -

<TextBlock
            DockPanel.Dock="Top"
            HorizontalAlignment="Center"
            TextAlignment="Left"
            Margin="0,0,0,6"
            FontSize="14"
            MaxLines="3"
            FontFamily="Segoe UI"
            FontWeight="DemiBold"
            TextWrapping="Wrap"
            MaxWidth="320"
            Text="www.htzone.co.il - מועדון הצרכנות של ההייטקיסטים and 5 more pages - Personal - Microsoft​ Edge" />

Application: fluentsearch.exe CoreCLR Version: 5.0.20.47505 .NET Version: 5.0.0-rc.2.20475.5 Description: The process was terminated due to an unhandled exception. Exception Info: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter ‘start’) at Avalonia.Utilities.ReadOnlySlice1.Take(Int32 length) at Avalonia.Media.TextFormatting.ShapedTextCharacters.Split(Int32 length) at Avalonia.Media.TextFormatting.TextFormatterImpl.SplitTextRuns(List1 textRuns, Int32 length) at Avalonia.Media.TextFormatting.TextFormatterImpl.PerformTextWrapping(List1 textRuns, TextRange textRange, Double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak currentLineBreak) at Avalonia.Media.TextFormatting.TextFormatterImpl.FormatLine(ITextSource textSource, Int32 firstTextSourceIndex, Double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak) at Avalonia.Media.TextFormatting.TextLayout.UpdateLayout() at Avalonia.Media.TextFormatting.TextLayout..ctor(String text, Typeface typeface, Double fontSize, IBrush foreground, TextAlignment textAlignment, TextWrapping textWrapping, TextTrimming textTrimming, TextDecorationCollection textDecorations, Double maxWidth, Double maxHeight, Double lineHeight, Int32 maxLines, IReadOnlyList1 textStyleOverrides) at Avalonia.Controls.TextBlock.CreateTextLayout(Size constraint, String text) at Avalonia.Controls.TextBlock.get_TextLayout() at Avalonia.Controls.TextBlock.MeasureOverride(Size availableSize) at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) at Avalonia.Layout.Layoutable.Measure(Size availableSize) at Avalonia.Layout.LayoutManager.Measure(ILayoutable control) at Avalonia.Layout.LayoutManager.ExecuteMeasurePass() at Avalonia.Layout.LayoutManager.InnerLayoutPass() at Avalonia.Layout.LayoutManager.ExecuteLayoutPass() at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) at Avalonia.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam) at Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg) at Avalonia.Win32.Win32Platform.RunLoop(CancellationToken cancellationToken) at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) at Blast.Program.Main(String[] args) in C:\Users\adirh\RiderProjects\Blast\Blast\Program.cs:line 85

[Gillibald]

Thanks for all the details. Helps a lot to fix this. Having a look asap.

[Gillibald]

The crash is fixed. The RTL text wrapping has its own issue.