Right-click menus in the dash can be dismissed by clicking anywhere
outside the menu. However, if a window clone is located beneath the
pointer when doing so, the window is activated and the overview
closed.
The cause of this unexpected behavior is that window previews are
activated on button-release, which is delivered to the preview after
the menu releases its grab on button-press. Use a ClutterClickAction
instead and let Clutter do the right thing, i.e. only trigger a
'clicked' signal when a button-release event is matched by a
corresponding button-press event.
https://bugzilla.gnome.org/show_bug.cgi?id=661151
7bc2573d85