Center a dialog window when it is displaying off-screen
Center a dialog window when it is displaying off-screen

Summary: Center a newly created dialog window when it is displaying off-screen.  Fixes T2419

Reviewers: zmike

Subscribers: cedric

Maniphest Tasks: T2419

Differential Revision: https://phab.enlightenment.org/D2646

FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment