<AWT Dev> RFR: 8256465: [macos11] Java frame and dialog presented full screen freeze application

Tejpal Rebari trebari at openjdk.java.net
Fri Apr 9 05:48:46 UTC 2021

Hi All,
Please review the following fix for jdk17.

Issue : On MacOS 11 Java Frame and JDialog application is freezing  in Full Screen  when the System Preference -> General -> Prefer Tabs is set to "Full Screen". It is also freezing in normal screen when Prefer Tabs is set to "Always".
It doesn't freeze when the Prefer tabs is set to "never".

Fix : The default value of allowsAutomaticWindowTabbing is 0/NO in MacOS prior to bigSur(11)  
(in the AWTWindow.m file),  so the issue is not seen in mac os 10.13 10.14 and 10.15.
>From MacOS 11 onwards  this value is set to 1/YES and the issue is seen.
This issue can also be reproduced in MacOS 10.15 by setting setAllowsAutomaticWindowTabbing to true in the AWTWindow.m file.

Fix is to set allowsAutomaticWindowTabbing to No for all the MacOS release staring from 10.12.
The allowsAutomaticTabbing was introduced in MacOS 10.12 but the default value changed in macos11.

Test : Added a manual test and tested on MacOS 10.15 and 11.
All the internal tests run are green.


Commit messages:
 - initial fix and test

Changes: https://git.openjdk.java.net/jdk/pull/3407/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3407&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256465
  Stats: 138 lines in 2 files changed: 138 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3407.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3407/head:pull/3407

PR: https://git.openjdk.java.net/jdk/pull/3407

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