RichEditBox doesn't work when typing over 9628 lines of texts

[Goldgom]

Describe the bug

RichEditBox doesn't work when typing over 9628 lines of texts.When you have over 9628 lines of text in the editbox.All the texts will show in line 9628;

Steps to reproduce the bug

        <RichEditBox x:FieldModifier="Public" 
                     x:Name="CodeArea" 
                     AcceptsReturn="True" 
                     TextWrapping="NoWrap"
                     ScrollViewer.VerticalScrollBarVisibility="Auto"
                     Margin="4"
                     TextChanged="CodeArea_TextChanged"
                     KeyDown="CodeArea_KeyDown"
                     Grid.Column="1" 
                     Width="Auto" 
                     Height="Auto" 
                     FontSize="14" 
                     FontFamily="Consolas"
                     AutomationProperties.Name=""
                     BorderThickness="0"
                     BorderBrush="Transparent"
                     ClipboardCopyFormat="AllFormats"
                     IsTextScaleFactorEnabled="true"
                     IsSpellCheckEnabled="false"
                     PreventKeyboardDisplayOnProgrammaticFocus="false"
                     BringIntoViewRequested ="CodeArea_RequestBringIntoView"

/>

Expected behavior

No response

Screenshots

NuGet package version

None

Windows version

No response

Additional context

No response

[github-actions]

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• Text not rendered in RichEditBox when large number of lines present (#1989), similarity score: 0.81

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