Top window border is missing in Windows
Categories
(Core :: Widget: Win32, defect, P3)
Tracking
()
People
(Reporter: back5576, Unassigned)
Details
(Whiteboard: [win:sizing])
Attachments
(2 files)
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:98.0) Gecko/20100101 Firefox/98.0
Steps to reproduce:
Deleted and re-installed Firefox
Actual results:
Top border is missing
Expected results:
Top border should be same as other three borders. Attached screenshot shows the top-left corner showing that left border is the blue that I have as system setting. But the top border is missing.
Comment 1•3 years ago
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The Bugbug bot thinks this bug should belong to the 'Core::Widget: Win32' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.
Reporter | ||
Comment 2•3 years ago
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I wish to add some additional information.
I observe this bug on Windows Server 2016.
No other applications on Windows Server 2016 have this issue.
I do not observe the bug in Windows 10.
I do not observe this bug on Windows Server 2019.
Comment 3•3 years ago
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Are you using multiple monitors? Does changing the window size make the border reappear?
Reporter | ||
Comment 4•3 years ago
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I do have two monitors. Changing the window size does not make the border appear.
Comment 5•3 years ago
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(In reply to back5576@gmail.com from comment #4)
I do have two monitors. Changing the window size does not make the border appear.
Could you tell me how your monitors are arranged? Are they side-by-side, or stacked vertically? Does changing the arrangement of your monitors in Windows settings change anything regarding the window border?
Reporter | ||
Comment 6•3 years ago
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Side by side.
Vertical stack didn't change missing top border.
Updated•3 years ago
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Comment 8•1 year ago
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(Drive-by, as I noticed this bug and can't un-see it)
Still happens on Win 10. Of note, setting browser.tabs.inTitlebar
to 0
recovers the top border, but also the Windows' native titlebar - Do we "clip away" the titlebar, along with the border?
Comment 9•11 months ago
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No, we just ask Windows (not) to draw the native titlebar at all.
Unfortunately, I can't repro on Win10: I get the accent color on all four sides. What's your display setup — that is, how many monitors do you have, and for each one, what's its resolution and scale-factor?
Comment 10•11 months ago
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2 monitors, 100% scaling on both, 1920x1080 and 2560x1440.
Moving monitors around, changing window size & entering/exiting fullscreen did not change the lack of the top border for me.
I tried unplugging each monitor's HDMI/DP (+ reboot to avoid any state shenanigans), so it was basically a single monitor setup, and it was still missing.
Reporter | ||
Comment 11•11 months ago
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I also have two monitors. 1920x1200.
I'll point out too that Chrome also has this problem on my computer. I just checked several other apps and don't see this problem with them.
When a Firefox or Chrome window has focus, only the side and bottom borders get painted blue. The top does not.
Comment 12•11 months ago
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I'll point out too that Chrome also has this problem on my computer.
So you're right - when it's active, at least, there's a grey bar on the right and the bottom side but not the top and the left side...?
However, when the window is inactive, the grey borders seem correct.
Actually, the bug goes away for me when I check the box in Windows' Personalization - "Show accent color on the following surfaces" - "Title bars and window borders". This show the top border with accent color when active, and grey color when inactive, like the rest of the sides, as expected. However, there still are some oddities:
- When Windows using the light theme, the top inactive border is noticeably darker.
- When switching Firefox in and out of the active window, I sometimes see a visible delay in the top border being painted the accent color.
- Turning off the accent color leaves Firefox's top border to be that accent color, but only when it's active (Reverts to missing top border behaviour on restart).
Comment 13•11 months ago
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(In reply to David Shin[:dshin] from comment #12)
Actually, the bug goes away for me when I check the box in Windows' Personalization - "Show accent color on the following surfaces" - "Title bars and window borders". This show the top border with accent color when active, and grey color when inactive, like the rest of the sides, as expected. However, there still are some oddities:
- When Windows using the light theme, the top inactive border is noticeably darker.
- When switching Firefox in and out of the active window, I sometimes see a visible delay in the top border being painted the accent color.
- Turning off the accent color leaves Firefox's top border to be that accent color, but only when it's active (Reverts to missing top border behaviour on restart).
I've managed to reproduce the first two of these. When "Show accent color on [...] title bars and window borders" is off, I can also reproduce the behavior of not having a border on the top edge of an inactive window even though borders are present on the sides and bottom. (This is somewhat obscured by the drop-shadow that Win10 puts on windows by default, but that can be turned off via "View advanced system settings" > "Performance".)
However, I haven't found any combination of settings that causes the accent color to be shown on only the sides and bottom of a Firefox window, as seen in the initial screenshot. @back5576, could you list off (or take screenshots of) the current state of your "Color settings" panel?
Reporter | ||
Comment 15•11 months ago
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I've attached a new file with a screenshot
Comment 16•11 months ago
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FWIW that border is added in CSS here.
Comment 17•11 months ago
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(In reply to Ray Kraesig [:rkraesig] from comment #13)
However, I haven't found any combination of settings that causes the accent color to be shown on only the sides and bottom of a Firefox window, as seen in the initial screenshot. @back5576, could you list off (or take screenshots of) the current state of your "Color settings" panel?
... because I had been testing on Windows 10, and had missed comment 1 noting that this was in Windows Server 2016. The behavior is trivially reproducible there; and, as in Win10, setting the Show color on title bar toggle makes it vanish. The bug :dshin and I are seeing is probably related, but subtly different — possibly just due to which color is called ActiveBorder
under Server 2016?
(In reply to Emilio Cobos Álvarez (:emilio) from comment #16)
FWIW that border is added in CSS here.
That's in a @media (-moz-windows-accent-color-in-titlebar)
group, though — it shouldn't explain the behavior we're seeing when that setting is off. I'm also mildly surprised that we're seeing full borders of consistent width when that setting is on!
Description
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