hg: openjfx/11-dev/rt: 8212060: [GTK3] Stage sometimes shown at top-left before moving to correct position

[johan at lodgon.com]

Changeset: 471d524e3d2b
Author:    kcr
Date:      2019-05-08 05:21 -0700
URL:       https://hg.openjdk.java.net/openjfx/11-dev/rt/rev/471d524e3d2b

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