[Bug]: serous bug geko rendering engine

[ale82to]

Steps to reproduce

in today android nighlty (v100 )if use this style (trough stylus,tampermonkey or even userchrome.css):
-webkit-text-stroke-width:.3px!important;
page font are messed up see screnshot :
https://i.imgur.com/BWYA7O1.jpg
can please someone explain what's going on ?

Expected behaviour

font should not be messed

Actual behaviour

font are messed up

Device name

No response

Android version

android 11

Firefox release type

Firefox Nightly

Firefox version

100

Device logs

No response

Additional information

No response

┆Issue is synchronized with this Jira Task

[kbrosnan]

Finding the build when this regressed would be helpful as this is a non-standard setup. I expect his reproduces on Geckoview example so you can use Mozregression with gve

[ale82to]

the last good version is 100.0a1 2015868771 before the white flash in dark mode start to happening again (I also reported that bug if matters ) is something to do with Gecko and gpu process about 10 days ago gpu process was enabled in about :config .
I tried disabling it in newer build but still the problem of font rendering remains it just mitigates (not completely solves white flash problem in dark mode ).

[kbrosnan]

@emilio @jamienicol any ideas about what is happening here?

[emilio]

@kbrosnan that looks like a WebRender text rendering bug. -webkit-text-stroke-width triggers fallback rendering rather than WR text rendering, so that might be the cause. However I don't see that happening neither on Android or Linux on my side.

From the screenshot it seems there are a few other extensions potentially involved. @ale82to does this happen on a clean profile / with extensions disabled, and just with the -webkit-text-stroke change? Or, what is the set of extensions etc that repro this for you?

[jamienicol]

@ale82to it would be really helpful if you could use mozregression to determine what change caused this text bug. It doesn't sound like it's to do with the GPU process if disabling it doesn't fix the issue.

The white flashes indeed sound like they were caused by the GPU process being enabled. But let's keep that in a separate bug. Do you have the bug number you filed for that?

[jamienicol]

@ale82to could you please also attach your about:support information

[ale82to]

@jamienicol I ve tested with all extensions disabled even on 3 different phone ,lineage 14 android 7) and lineage 18 (Android 11)

[ale82to]

this the about:support of the phone I'm using :
{
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"name": "Firefox Nightly",
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},
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[jamienicol]

Thanks @ale82to!

This was rather tedious, but I managed to get a regression range in GVE by manually installing the stylus addon and setting that style. It gave this range ie bug 1758555

@kbrosnan Do you want to move this bug to bugzilla and we can take it from there?

@ale82to FYI I figured out the white flash problem and the fix should be in Nightly and Beta soon. - see bug 1760794

[ale82to]

issue is fixed since a couple of nighlty hopefully ,thanks !