Fix bug 3301 (selecting buttons (e.g. a citation) with the mouse opens dialog)

Fix bug 3301 (selecting buttons (e.g. a citation) with the mouse opens dialog)

	* insets/InsetExternal.cpp (doDispatch):
	* insets/InsetGraphics.cpp (doDispatch):
	* insets/InsetInclude.cpp (doDispatch):
	* insets/InsetCommand.cpp (doDispatch):
	* insets/InsetVSpace.cpp (doDispatch): do not open dialog if a
	selection is set.

	* insets/InsetRef.cpp (doDispatch):
	* insets/InsetCharStyle.cpp (doDispatch): act on mouse release, not
	mouse press.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18473 a592a061-630c-0410-9148-cb99ea01b6c8