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This morning I worked on remembering the size for floating windows when they go to the tiling layout and back.

The whole sizing code must be at the top by logic complexity in niri. I have to juggle, all at once:

- new size I haven't sent to the window yet,
- size changes I sent, but window hasn't acked yet (0, 1, or more in-flight),
- size change window acked but hasn't committed for yet,
- size change window acked and responded to with a commit (maybe with a different size entirely).

#niri