This tells the context that an allocation width or height
(or both) have been decided for a group of rows. The context should
store any allocations for internally aligned cells at this point so
that they dont need to be recalculated at gtk.cell_area.CellArea.render time.
This tells the context that an allocation width or height (or both) have been decided for a group of rows. The context should store any allocations for internally aligned cells at this point so that they dont need to be recalculated at gtk.cell_area.CellArea.render time.