1219747 - [Windows 10] Glitches visible at the minimize button using High Contrast themes

Status: RESOLVED WORKSFORME

(Firefox :: Theme, defect)

Description

[Cornel Ionce [:noni] [Hubs QA]]

Reproduced on Windows 10 using:
*42.0RC build 1
*Latest 43.0a2 Aurora
*Latest 44.0a1 Nightly

STR:
1. Make sure you are using a High Contrast Windows theme (I recommend Hight Contrast White, as the issue is more visible there).
2. Open Firefox and maximize it.
3. Hover over the minimize button.

Expected Result:
The minimize button is correctly displayed in the hover state.

Actual Result:
Two small glitches can be observed for the minimize button:
*a white line: http://i.imgur.com/E0wDnTh.png
*a small black dot: http://i.imgur.com/lMaIJ0W.png

Notes:
This is also visible in Window Mode for HiDPI devices.
This is visible using any of the High Contrast themes, but on White is the most visible.

Regression Range:
Last-good buildID: 20150923030230
First-bad buildID: 20150924030231

Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=19b4265d0d568d232fb3a34705f947b6db7496dc&tochange=bf2bc1aa78c0b72d9b6b13f7a8c6ae61c60a51dc

Caused by: Bug 1190462 - [Windows 10] Invisible tabs with "High Contrast White" system theme

Comment 1

[:Gijs (he/him)]

(In reply to Cornel Ionce [QA] from comment #0)
> Regression Range:
> Last-good buildID: 20150923030230
> First-bad buildID: 20150924030231
> 
> Pushlog:
> https://hg.mozilla.org/mozilla-central/
> pushloghtml?fromchange=19b4265d0d568d232fb3a34705f947b6db7496dc&tochange=bf2b
> c1aa78c0b72d9b6b13f7a8c6ae61c60a51dc
> 
> Caused by: Bug 1190462 - [Windows 10] Invisible tabs with "High Contrast
> White" system theme

Please always mark the regressing bug as blocking/dependent when filing regression bugs.

Comment 2

[Justin Dolske [:Dolske]]

Curious. If I make the titlebar-spacer at transparent-red, the white line turns pink. Which means it's under it. In fact, if I display:none the entire button, it turns out that the normal Windows captions buttons are underneath ours. And are actually slightly wider, resulting in the extra line. http://imgur.com/a5MSVa7 (with our min and max buttons hidden).

Comment 3

[Dana Lucaci, Desktop QA]

This issue is not reproducible anymore using the latest Firefox 123.0 build on Win 10. I'm closing it as WFM.