Sets widget as the widget that this will capture key events from.
Key events are consumed by the search entry to start or continue a search.
If the entry is part of a `GtkSearchBar`, it is preferable to call [[email protected]_key_capture_widget] instead, which will reveal the entry in addition to triggering the search entry.
Note that despite the name of this function, the events are only 'captured' in the bubble phase, which means that editable child widgets
of widget will receive text input before it gets captured. If that is not desired, you can capture and forward the events
yourself with [[email protected]].
| this |
a `GtkSearchEntry` |
| widget |
a `GtkWidget` |