Paintable.invalidateSize

Called by implementations of gdk.paintable.Paintable to invalidate their size.

As long as the size is not invalidated, paintable must return the same values for its intrinsic width, height and aspect ratio.

This function will emit the gdk.paintable.Paintable.invalidateSize signal.

If a paintable reports the gdk.types.PaintableFlags.Size flag, it must not call this function.