Root cause: toggleterm uses botright split (tabpage-level) and
find_open_windows() jumps to existing terminals across tabpages,
destroying window layouts. persist_size=false in Terminal opts was
never consumed by toggleterm's ui.get_size().
Changes:
- Replace toggleterm Terminal cache with own {bufnr, winid, job_id, cmd}
- Use rightbelow {size}split/vsplit (current-window-local)
- Three-path open: hide (close win), restore (assign buf to new split), create
- winfixwidth/winfixheight to protect terminal window size
- bufhidden=hide to keep process alive on window close
- <C-\><C-\> hide keymap on terminal buffers
- config.debug flag for layout diagnostics
- pcall toggleterm setup(persist_size=false) as safety net
QQ