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Problem: terminal mode cursor refresh logic has too many edge cases where it fails when events change curbuf. Solution: change the logic. Introduce cursor_visible to TerminalState to more reliably track if terminal mode has changed busy. Move visibility handling to refresh_cursor and move its call in refresh_terminal to terminal_check to avoid temporarily changed curbufs from influencing cursor state. This has the effect of "debouncing" shape/visibility updates to once per terminal state tick (with the final attributes taking effect, as expected). I think this is OK, but as a result it may also be warranted to update when redrawing during the same state tick (e.g: from events executing :redraw); this can be added later, if wanted. Also move previous tests to a more appropriate place.