TextBlock Text Jumping Around Despite Fixed Width Font.

[l0hn]

Describe the bug

When using a fixed width font, the bounds of a TextBlock keep changing when the text changes, despite the text having the same amount of characters.

e.g. a clock with the text changing from "00:18:11" to "00:18:12":

This causes the text to jump left and right as the time changes.

To Reproduce

1. Use a TextBlock and a fixed width font
2. Change the text in the TextBlock to an equal length string with different characters.
3. Observe the bounds changing.

Expected behavior

Text should be rendered in the same position and not jump around.

Avalonia version

11.0.11

OS

macOS

Additional context

No response

[l0hn]

Hmm, I tried a few other fixed width fonts and it does seem to be an issue with a lot of them.

• PT Mono
• Consolas
• Coureier New

All have the same problem

[stevemonaco]

Try upgrading to newest or nightly Avalonia. Besides that, try using LetterSpacing so that the kerning is consistent as a workaround. eg. <TextBlock Text="Testing" LetterSpacing="1" />

[l0hn]

Hi @stevemonaco. Can confirm setting LetterSpacing="1" resolves this.