Removes a widget from the list of mnemonic labels for this widget.
See [method@Gtk.Widget.list_mnemonic_labels]. The widget must have previously been added to the list with [method@Gtk.Widget.add_mnemonic_label].
a GtkWidget that was previously set as a mnemonic label for @widget with [method@Gtk.Widget.add_mnemonic_label]
See Implementation
Removes a widget from the list of mnemonic labels for this widget.
See [method@Gtk.Widget.list_mnemonic_labels]. The widget must have previously been added to the list with [method@Gtk.Widget.add_mnemonic_label].