New PR's for Ty fixes

[Ville M. Vainio]

Two small PRs against devel. 

Once these are in, we can make CI to fail when Ty check fails.

- #4851 — https://github.com/leo-editor/leo-editor/pull/4851 — ty diagnostics 112 → 22 (rest are deprecation warnings). Mostly type annotations and real-bug fixes found along the way, plus removal of dead `p.archive()`. Also swaps ~26 per-line `# ty: ignore[invalid-method-override]` comments on Qt overrides for one global rule in `ty.toml` (Qt stub param names like `a0`/`a1` never match ours, not real Liskov issues).

- #4853 — https://github.com/leo-editor/leo-editor/pull/4853 — replaces remaining deprecated stdlib calls (`os.system`/`os.spawn*`/`os.popen`, `codecs.open`, `Thread.setDaemon`) with `subprocess`/`open`/`.daemon`. Clears ty's last 22 diagnostics.

CI/mypy/ty/ruff clean on both. No manual testing done — worth checking:

- #4851: undo/redo, headline/body edits, tree redraw after headline change, graphcanvas.

- #4853: gitarchive, vim/xemacs bridges, open_shell, screenshots, viewrendered's PlantUML.

[Edward K. Ream]

On Friday, August 7, 2026 at 4:40:39 AM UTC-5 Ville M. Vainio wrote:

Two small PRs against devel. 

- #4851 — https://github.com/leo-editor/leo-editor/pull/4851

- #4853 — https://github.com/leo-editor/leo-editor/pull/4853

I wouldn't call these small PRs! Both have now been merged into Leo's "devel" branch.

Many thanks for this excellent work.

Please keep testing "devel". We are on track to release Leo 6.8.10 in two weeks.

Edward