[Lazarus] Gtk2 under X11 new feature - accurate frame size - need users feedback

[zeljko]

Hi all,

Finally I've fixed gtk2 under x11 too (qt/qt5 are fixed 2 days ago), now
GetWindowRect() returns correct form size (with frame around) , so
now eg poScreenCenter/poWorkAreaCenter (poWorkAreaCenter is also fixed - 
Screen.WorkAreaRect was same as Screen.DesktopRect because of wrong 
implementation of SPI_GETWORKAREA) is perfectly centered on screen.

https://bugs.freepascal.org/view.php?id=36897
https://bugs.freepascal.org/view.php?id=36919

Feature can be disabled with -disableaccurateframe.

Please test and send feedback, or open issues about it :)

zeljko