Gtk.CellArea.prototype.add_focus_sibling

function add_focus_sibling(renderer:Gtk.CellRenderer, sibling:Gtk.CellRenderer):void {
    // Gjs wrapper for gtk_cell_area_add_focus_sibling()
}

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.

Since 3.0