On Mon, 4 Dec 2023 23:26:12 GMT, Alexander Zvegintsev <azveg...@openjdk.org> 
wrote:

> The root of this issue is the incorrect calculation of window decoration 
> insets.
> 
> Previously we got non-zero window insets in the first PropertyNotify with 
> [_NET_FRAME_EXTENTS](https://specifications.freedesktop.org/wm-spec/wm-spec-latest.html#idm45771211302000)
>  atom, save them and never change them again.
> 
> This changed starting with Ubuntu 23.04:
> Now we can get several such notifications with zero window insets, and only 
> then the correct value.
> 
> Our code is not ready for this. It affects all our JDK. As a result, many 
> tests fail on Ubuntu 23.04 and 23.10.
> 
> The solution is to change these insets on the fly, for now only for Mutter 
> window manager. 
> The guessInsets for it have also been updated.
> 
> 
> This also means that some tests need some stabilization as they are not ready 
> for such late arrival of window insets.
> 
> Testing looks good.

Marked as reviewed by aivanov (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/16960#pullrequestreview-1768753364

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