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In the case where we deselect the previously selected font (e.g. because we've just changed the filter settings to remove it from the list), we were leaving the preview pane in its previous state, which is fine in GTK2 when it just carries on displaying the last thing drawn to the backing pixmap but goes wrong in GTK3 where we still have to actually respond to draw events. But it makes more conceptual sense anyway to actually empty the preview pane when no font is selected, so now we do that. So now unifontsel_draw_preview_text() is called from unifontsel_deselect(), and also the preview-drawing code will still draw the background rectangle regardless of whether font != NULL.