<AWT Dev> [9] Review request for 8167652: Making a frame/dialog resizeble/unresizeble shifts its position on Unity.

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8167652

webrev: http://cr.openjdk.java.net/~ssadetsky/8167652/webrev.00/

In Linux, when a frame or dilalog is made resizable or non-resizable the 
window decoration need to be updated. For that purpose window is 
unmapped and mapped again and WM changes the window decoration parent. 
The re-parenting may cause WM to send intermediate "artifact events" 
which change the window location on the screen, this WM behavior is 
undocumented. To avoid window move the window shift is compensated in 
XWM.setShellResizable()/XWM.setShellNotResizable(), but Unity WM shifts 
the window position in different way. In the proposed solution the 
window shift compensation is adjusted for Unity WM.

Also in the fix all writes to the fields that store the current state of 
window dimensions are protected with the AWT lock. This is necessary to 
avoid unexpected window move or resize when the window dimensions are 
changed from the user thread concurrently while the AWT toolkit thread 
handles WM sent notifications affecting the current window state, size, 
position, insets, etc.

--Semyon