Launcher: Click+hold, drag mouse away, release, shouldn't launch
If you click and hold on a launcher that has only one item in its list (ie, does not have a pull down menu, is just a single icon), then move the mouse outside of the panel and release the button, the app is still launched. This is different from how it behaved before XFCE was migrated to GTK3.
Steps to reproduce: Left click on a panel launcher that does not have a pull down menu, and hold. Move the mouse outside of the panel. Release the left mouse button. Observe that the app is launched.
Expected behaviour: nothing should happen, nothing should be launched