Removes a widget from the list of mnemonic labels for this widget.
See [[email protected]_mnemonic_labels]. The widget must have previously been added to the list with [ [email protected]_mnemonic_label].
| this |
a `GtkWidget` |
| label |
a `GtkWidget` that was previously set as a mnemonic label for this with [ [email protected]_mnemonic_label] |