Bubbling and precedence fixes, protoatom precedence, visualize antiprecedence
Click selection works more or less.
Explicit undo/redo context.  Undo and redo appear to work.
Fixed undo and refocus with for wedge protoatom self deletion
Scrolling works with some hacks!
More scrolling fix hacks.
Framing and unframing working.
Delete statement fix.