Sets whether the preview widget set by
gtk_file_chooser_set_preview_widget() should be shown for the
current filename. When active is set to false, the file chooser
may display an internally generated preview of the current file
or it may display no preview at all. See
gtk_file_chooser_set_preview_widget() for more details.
Sets whether the preview widget set by gtk_file_chooser_set_preview_widget() should be shown for the current filename. When active is set to false, the file chooser may display an internally generated preview of the current file or it may display no preview at all. See gtk_file_chooser_set_preview_widget() for more details.