Black bars when windows spawn

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Tordenflesk
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Black bars when windows spawn

Post by Tordenflesk » 2026-04-10, 15:08

Main Window, Reminders, New E-mails, Events get a black border at the bottom/sides that disappear as soon as I start resizing the window.

-> https://i.imgur.com/Tls4JDs.png

Windows 10

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athenian200
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Re: Black bars when windows spawn

Post by athenian200 » 2026-04-10, 16:24

Hmm... can't reproduce on my machine.

However, looking at your screenshot, I can't help but notice the fonts you're using look very different from the Windows default? I would guess that might be the issue, though I am not really sure why a different font would introduce such an issue or how to work around it.
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Moonchild
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Re: Black bars when windows spawn

Post by Moonchild » 2026-04-11, 06:47

Can't reproduce either but it's probably just a first-paint issue related to theme or theme overrides. That can sometimes happen (e.g. if there are many CSS rules to be processed on XUL windows and they involve required repaints of the window) if the widow is painted before all styling is fully processed (drawback of having startup be done as fast as possible).
You may be able to work around this by tweaking nglayout.initialpaint.delay
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Veit Kannegieser
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Re: Black bars when windows spawn

Post by Veit Kannegieser » 2026-05-01, 21:13

Do you have hardware acceleration enabled?
I see this on a old/slow machine when having
user_pref("layers.acceleration.enabled", true); in prefs.js.