Inconsistent rendering of characters

[edemaine]

Windows Terminal version

1.15.2713.0

Windows build number

10.0.22000.1098

Other Software

Cygwin vim 8.2
zsh 5.8

Steps to reproduce

Type in some text such as console.log 'hello', palette in vim or zsh

Possible relevant:

• System / Display / Custom scaling of 135%
• 3840x2160 monitor
• Font is Hack FC Ligatured at 14pt. Also tried a more vanilla Hack with similar effects.
• Text antialiasing set to ClearType. (Also tried Grayscale with similar effects.)
• No apparent difference with "Redraw entire screen" or "Use software rendering" turned on.

Expected Behavior

Identical characters to look similar

Actual Behavior

Some strokes look thicker than they should, with possible overdraw.

In Vim: look at weird s and different os

In zsh: look at different hs and ls

[lhecker]

Do you have the "AtlasEngine" feature enabled under the "Rendering" settings? Could you try toggling the switch and restarting Windows Terminal to see how the other rendering mode works for you?

[zadjii]

This is #4591

[edemaine]

Agreed, @zadjii, this seems like the same as #4591. Thanks for spotting. (I did try to look for scaling issues, but missed this one.)

@lhecker I don't see an AtlasEngine option. Is it one of the following?

[lhecker]

Ah sorry, I thought we had merged that into the 1.15 release branch as well. If you install Windows Terminal Preview (1.16) the issue will most likely not occur anymore.

[edemaine]

Oh, thanks. On 1.16.2642.0 with Atlas turned on (as is the default), I see a different issue:

Both lines should be identical, but the top one has weird rendering. Moving lines up and down consistently misdraws the top line (whichever one is in the second row of the window).

Perhaps clearer with antialiasing turned off:

I assume this is also #4591, or should I open a different issue?

[lhecker]

Interesting! I'd say it's the same issue even if it behaves slightly different. I suspect this is a bug in Direct2D which we can't do that much about just yet as we depend heavily on it. But I'll have to look into it first...