BUG: TextBlock does not center correctly when text is surrounded by equal number of spaces

[kuiperzone]

NB. Yes I know I should submit it as a bug, but the Github Issue page is not working. The SUBMIT is grayed out.

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TextBlock does not seem to be center correctly when text is surround by equal number of spaces both sides, including NBSP characters. I suspect it may be trimming one side.

The screenshot below is generated with the following text:

" H-Center \nV-Middle\nLarger", "font-size:larger"

May seem trivial, but I'm using NBSP characters and nothing would align. Took me two days to figure out the reason.

Perhaps trimming text is intentional behaviour? I'm guessing it is related to a workbreak algorithm? But I think that text should not be trimmed by default after an explicit line break.

[Gillibald]

WPF is producing the same which makes sense. Only trailing spaces are ignored.

[kuiperzone]

I'm seeing examples like the following with regard to preserving spaces:

<TextBox xml:space="preserve" Name="StructTextBox" Width="129" Height="50" VerticalAlignment="Top" HorizontalAlignment="Left" IsHitTestVisible="False" TextWrapping="Wrap" >Fire control Panel Hello World</TextBox>

This looks like it relates to parsing the XAML. However, there is no XAML in my project whatsoever. Everything is runtime. In fact, I'm populating TextBlock entirely with the Inline Run class and never setting the Text property. There's WPF post I saw suggesting Run is a possible solution, but screenshot above was created with Run.

Anyway to preserve spaces at runtime?

[timunie]

@kuiperzone can you provide a very minimal sample here? I can't really understand how you produce the text.

[kuiperzone]

Sure thing:

protected override void OnOpened(EventArgs e)
{
    base.OnOpened(e);

    var text = new TextBlock();
    text.HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center;
    text.Inlines.Add( new Run("\u00A0\u00A0\u00A0\u00A0H-Center\u00A0\u00A0\u00A0\u00A0\nV-Middle\nLarger") );
    Content = text;
}

[kuiperzone]

NB. Equal spaces on either side of H-Center

Am using NBSP, but same output with normal space. (In my context, the controls are being constructed at runtime, so it's not just a case of changing Text in XAML for me).

[kuiperzone]

And same with this:

    var text = new TextBlock();
    text.HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center;
    text.Inlines.Add( new Run("\u00A0\u00A0\u00A0\u00A0H-Center\u00A0\u00A0\u00A0\u00A0") );
    text.Inlines.Add( new LineBreak() );
    text.Inlines.Add( new Run("V-Middle") );
    text.Inlines.Add( new LineBreak() );
    text.Inlines.Add( new Run("Larger") );
    Content = text;