Hopefully this helps.

Several reasons for this:

- Remove the sizing code from interactive move duplicated with
  toggle_window_floating.
- Make the tiled size restore too instead of requesting 0x0 (which
  doesn't work for windows in the Tiled state).

Subsequent commits will add merging for all leftover sections.

I didn't properly update it for the Smithay refactor. It was reading
initial_configure_sent too early. This worked before when niri had to reset it
manually, but it no longer works now that it is automatically reset already
before entering this function.