hg: openjfx/jfx-dev/rt: 8212060: [GTK3] Stage sometimes shown at top-left before moving to correct position

[kevin.rushforth at oracle.com]

Changeset: 3e09b6bdf762
Author:    kcr
Date:      2019-05-08 05:21 -0700
URL:       http://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/3e09b6bdf762

8212060: [GTK3] Stage sometimes shown at top-left before moving to correct position
Reviewed-by: kcr, pbansal
Contributed-by: thiago.sayao at clamed.com.br

! modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp