STR: 0. Have a debug build (I've only reproduced this in debug builds, so far; not in nightly) 1. Load these two URLs, in adjacent tabs: data:text/html,<div%20style="height:100%;width:100%;background:lime">abc data:text/html,<div%20style="height:100%;width:100%;background:red">abc 2. Use "Ctrl +" to zoom in a few times in each tab (doesn't necessarily have to be the same amount) 3. Switch back and forth between the tabs. ACTUAL RESULTS: Only an upper-left area of the tab is repainted. (The higher the zoom-level, the smaller the area)
Hmm; I can reproduce this on my desktop machine at work (in two different debug builds), but not on my laptop. [Removing a few local-hacks-that-I-don't-expect-to-influence-behavior to see if they might be responsible...]
Never mind, I can reproduce this on both my desktop and my laptop, with a TBPL-generated debug build from: https://tbpl.mozilla.org/?rev=0dc711216018 http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-central-linux64-debug/1405947507/ ...and with the opt build from the same cset: http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-central-linux64/1405947507/ So I'm guessing this is just a very-recent regression.
Created attachment 8459842 [details] screencast Here's a screencast of the bug, using the opt m-c build from TBPL mentioned in previous comment.
4 years ago
(Paint flashing confirms that only the upper-left region is getting repainted -- as you might expect, based on the symptoms displayed in the screencast)
(I initially thought this might be due to OMTC, since that was briefly turned on and then off today, in bug 994541. But I don't think that's responsible, because layers.offmainthreadcomposition.enabled is set to 'false' (by default) in the build I'm testing.)
Maybe duplication of Bug 1041200
Yup, looks a lot like it, based on the symptoms. Thanks!
Status: NEW → RESOLVED
Last Resolved: 4 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1041200
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