WindowStartupLocation does not show window on expected position

[ficnar]

Using WindowStartupLocation property not show window on expected position.
Tested on 0.6.2-build6147-beta

On Windows:
CenterOwner - show window top-left from the expected position
CenterScreen - OK

On Linux:
CenterOwner - show window bottom-right from the expected position
CenterScreen - show window bottom-right from the expected position

On Mac OSX:
CenterOwner - show window on static position independently on owner position, horizontally centered to screen, vertically top of center screen
CenterScreen - OK

[na2axl]

For me (on Linux) CenterScreen uses as origin the top-left corner of the window :

[grokys]

Should have been fixed by #2250. Please let me know if not.

[ficnar]

@grokys With night build 0.7.1-cibuild0001581-beta now work properly:
Windows: - all is OK
Linux: - center to screen is OK, center to parent is a little bit top-left from expected position, but it is OK
OSX: center to screen is OK, center to parent is a litle bit top-right from expected position, but it is OK