This rewinds the fix for revision 50483. - the removed code there (as comment said) closes menus on hoovering over another button in panels. Is unfinished feature to allow quick inspecting menus by mouse-hold going over menu popup buttons. - It added yet another check for closing menus - should be done with ->saferct - The actual bug was simple; the block flag with UI_BLOCK_MOVEMOUSE_QUIT was accidentally cleared for colorpickers.