hg: openjfx/9-dev/rt: 8172847: [macos] If you hit the escape key repeatedly to close the subwindow, the process crashes

[alexander.zvegintsev at oracle.com]

Changeset: b298c353d43e
Author:    azvegint
Date:      2017-06-13 21:21 +0530
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/b298c353d43e

8172847: [macos] If you hit the escape key repeatedly to close the subwindow, the process crashes
Reviewed-by: kcr

! modules/javafx.graphics/src/main/native-glass/mac/GlassTouches.m