DevCharly opened a new pull request #2760:
URL: https://github.com/apache/netbeans/pull/2760


   This FlatLaf update fixes a regression in FlatLaf 1.0-rc2 (and older)
   that breaks the Jvi plugin as soon as a popup should be shown. 
   E.g. pressing `:w` in editor.
   https://issues.apache.org/jira/browse/NETBEANS-5362
   
   FlatLaf 0.31, which was used in NB 12.2 (and before), did not have this 
issue.
   So only NB 12.3 betas are affected.
   
   The NPE occurs when invoking `PopupFactory.getSharedInstance().getPopup( 
owner, contents, x, y )`
   with `null` as `owner`, which is actually unusual.
   `PopupFactory` is e.g. used to show popups for code completion.
   
   There are about 30 source files in NB repo that use `PopupFactory`:
   https://github.com/apache/netbeans/search?q=popupfactory
   
   So it is possible that also some popups in NB core are affected by this 
Flatlaf bug.
   
   Hope we can get this fix into 12.3 beta 3.


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