7a409bfffc
Previously backspace would only ever remove a single character left of the cursor, regardless of selection. This requires the application to correctly set the anchor position in text_input::set_surrounding_text(), which currently only gtk4 seems to do. When there is no selection or on other applications that always set cursor = anchor, like gtk3 does, the behavior is not changed and still only deletes one character. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2746>