removeMnemonicLabel
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.
Parameters
label
a GtkWidget that was previously set as a mnemonic label for @widget with method@Gtk.Widget.add_mnemonic_label