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Bugzilla issue details TopComponent shows mnemonics for some of its input fields. However these mnemonics clash with main menu accelerators, e.g. Alt+F should open File menu. See #212043 Only modal dialogs can use mnemonics for its input fields.
I think I filed this before and was rejected with the note that any window can choose to use mnemonics. The real bug to me is that the window system processes mnemonics of components in a nonfocused window.
*** This bug has been marked as a duplicate of bug 182834 ***