18 Menu
Classes created with this mixin remember their keybindings so the
keybindings can be removed and then restored.
Sets the keyboard shortcut to the setting it had when the class was
created.
These menus can save and restore the underscores (indicated
via the & characters in the original labels) in their
labels.
If the preference
'framework:menu-bindings
is
#f, calls
erase-underscores
during initialization.
Erases the underscores in the label of this menu, but
remembers them so they can be restores with
restore-underscores.
Restores underscores in the menu’s label to their original
state.