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aa4e47f704
Problem: nvim_buf_set_text(), nvim_open_term() and termopen() all change buffer text, which is forbidden during textlock. Additionally, nvim_open_term() and termopen() may be used to convert the cmdwin buffer into a terminal buffer, which is weird. Solution: Allow nvim_buf_set_text() and nvim_open_term() in the cmdwin, but disallow nvim_open_term() from converting the cmdwin buffer into a terminal buffer. termopen() is not allowed in the cmdwin (as it always operates on curbuf), so just check text_locked(). Also happens to improve the error in #21055: nvim_buf_set_text() was callable during textlock, but happened to check textlock indirectly via u_save(); however, this caused the error to be overwritten by an unhelpful "Failed to save undo information" message when msg_list == NULL (e.g: an `<expr>` mapping invoked outside of do_cmdline()).
