fix(terminal): improve cursor refresh handling (#32596)

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.

0 files changed, 0 insertions, 0 deletions