Description of problem:
when a drop down has focus in an application (whether it is the terminal window, and you have clicked on 'Help' to see the drop down, or you are in Firefox and you have clicked the down arrow to see a browser's history), the keyboard mappings lose their ability until you have closed that drop down. Alt+Tab becomes unresponsive, Ctrl+Alt+[Arrow] (switching desktops) stops working until you close the drop down by making a selection within it or selecting outside of that drop down area.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2.Click 'Help' to expand the 'Help' menu, but leave the mouse/arrow/pointer above the word 'Help' so that it does not lose focus.
3.Press Alt+Tab to change applications
4.Observe that nothing happens
Keyboard mappings are frozen
The currently open drop down should lose focus (close/disappear), and keyboard mappings should work.
Seems to be unified across all applications.
This is deeply ingrained in the design of the window system, and essentially unfixable.