Window location has decoration offset under Unity

[mgarin]

There is a native issue with Unity manager that can be reproduced under any JDK version - whenever you set window location directly it gets an offset equal to the native decoration size.

Unfortunately, this seems to be a general problem for any JDK/Unity combination and it heavily affects library parts which deal with natively decorated window positioning, for instance, things like RootPaneSettingsProcessor.

Unity can be detected by checking this environment variable:

System.getenv ( "XDG_CURRENT_DESKTOP" )

Output can be checked for Unity string.

[mgarin]

I will be moving this to v1.3.0 to push v1.2.9 as early as possible.