vim-patch:9.1.0171: Small split-move related improvements

Problem:  small improvements can be made to split-move related
          functions.
Solution: apply them (Sean Dewar):

Some of these changes were already applied to Nvim.
Here are the ones which were missing:

- Improve some doc comments (frame_flatten should still work for non-current
  tabpages, despite the topframe check, which looks benign, though I'm unsure if
  it's still needed; see vim/vim#2467).

- f_win_splitmove should check_split_disallowed on wp, not targetwin, as that's
  what win_splitmove checks (though it's probably unnecessary to check
  b_locked_split at all; see vim/vim#14109, which I hope to get around to
  finishing at some point).

- Apply the winframe_restore comment changes, and remove win_comp_pos from after
  winframe_restore in win_splitmove, as it shouldn't be necessary (no need to
  remove it from nvim_win_set_config too, as it was already omitted).
  Move win_append after winframe_restore in win_splitmove to match Vim.

closes: vim/vim#14185

https://github.com/vim/vim/commit/5cac1a9bee0798d70a7fd80363a1f697759638e8

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