[twizzle] Coalescing on click moves isn't reflected in timeline alg

[rokicki]

If you click a "U" move three times, coalescing of moves works great in the alg text area and looks great visually. But after those moves, the alg shows "U'" (correct) but the timeline still thinks the moves are three independent "U" moves.

[rokicki]

Mostly resolved as of 30 September. Leaving open so we can check all the dark corners.