- Functions are way too long. Readability and maintainability should
be slightly improved.
- Some variables are re-assigned to their initial value at teardown.
This should not be needed since all internal variables are
re-initialized at startup of every Termdebug session.
Only include:
- prompt-mode buffer tracking changes around `promptbufnr`
- prompt buffer cleanup in `CloseBuffers()` and `EndDebugCommon()`
- related `BufUnload` and gdb startup failure cleanup adjustments
The remaining upstream `StartDebug_term()` refactor and helper extraction
do not apply here.
closes: vim/vim#15086225d4d9212
Co-authored-by: Ubaldo Tiberi <ubaldo.tiberi@gmail.com>
AI-assisted: Codex
6e7fb51813
