Sets whether a number should be added to the items shown by the
widgets representing @action. The numbers are shown to provide
a unique character for a mnemonic to be used inside the menu item's
label. Only the first ten items get a number to avoid clashes.
Sets whether a number should be added to the items shown by the widgets representing @action. The numbers are shown to provide a unique character for a mnemonic to be used inside the menu item's label. Only the first ten items get a number to avoid clashes.