branch scratch/ns/draw-to-bitmap created (now 53f3d1f)

[Alan Third]

athird pushed a change to branch scratch/ns/draw-to-bitmap.

        at  53f3d1f   Draw to offscreen buffer on macOS

This branch includes the following new commits:

       new  5166794   Revert "Fix some NS drawing issues (bug#32932)"
       new  301f101   Revert "Ensure NS frame is redrawn correctly  after 
scroll"
       new  f012866   Revert "Make all NS drawing be done from drawRect"
       new  53f3d1f   Draw to offscreen buffer on macOS