RFR: 8305825: getBounds API returns wrong value resulting in multiple Regression Test Failures on Ubuntu 23.04 [v2]

[Alexander Zvegintsev]

> 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.

Alexander Zvegintsev has updated the pull request incrementally with one additional commit since the last revision:

  copyright year updates

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16960/files
  - new: https://git.openjdk.org/jdk/pull/16960/files/2ed7c837..f2210a19

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16960&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16960&range=00-01

  Stats: 5 lines in 5 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/16960.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16960/head:pull/16960

PR: https://git.openjdk.org/jdk/pull/16960