Adds sibling to renderer’s focusable area, focus will be drawn around renderer and all of its siblings if renderer can focus for a given row.
Events handled by focus siblings can also activate the given focusable renderer.
the gtk.cell_renderer.CellRenderer expected to have focus
the gtk.cell_renderer.CellRenderer to add to renderer’s focus area
Adds sibling to renderer’s focusable area, focus will be drawn around renderer and all of its siblings if renderer can focus for a given row.
Events handled by focus siblings can also activate the given focusable renderer.