Installs an accelerator that will cause the named action
to be activated when the key combination specificed by accelerator
is pressed.
accelerator must be a string that can be parsed by gtk.global.acceleratorParse,
e.g. "<Primary>q" or “<Control><Alt>p”.
action_name must be the name of an action as it would be used
in the app menu, i.e. actions that have been added to the application
are referred to with an “app.” prefix, and window-specific actions
with a “win.” prefix.
Installs an accelerator that will cause the named action to be activated when the key combination specificed by accelerator is pressed.
accelerator must be a string that can be parsed by gtk.global.acceleratorParse, e.g. "<Primary>q" or “<Control><Alt>p”.
action_name must be the name of an action as it would be used in the app menu, i.e. actions that have been added to the application are referred to with an “app.” prefix, and window-specific actions with a “win.” prefix.
GtkApplication also extracts accelerators out of “accel” attributes in the #GMenuModels passed to gtk.application.Application.setAppMenu and gtk.application.Application.setMenubar, which is usually more convenient than calling this function for each accelerator.