If you are using manual invalidations, this informs the window system that a section needs to be redrawn.
If you didn't opt into manual invalidation, you don't have to call this.
See Implementation
Added December 30, 2021 (dub v10.5)
If you are using manual invalidations, this informs the window system that a section needs to be redrawn.
If you didn't opt into manual invalidation, you don't have to call this.