GeezerVison

Preserve a runtime when --one is used without filters

src/​manage/​list_command.py:388

Without any filters, tags is empty, so the new loop never adds a candidate and line 404 replaces the installed runtimes with an empty list. Consequently, py list --one -f=exe produces no executable even when a default runtime is installed. Preserve the marked default (or first available runtime) when there are no filters, and use the per-tag selection only for explicit filters.

Use listing aliases when selecting filtered prerelease runtimes

src/​manage/​list_command.py:400

This second filtering pass requires a matching run-for alias, although listing uses install-for aliases. Prerelease records generated by scripts/generate-nuget-index.py include 3-dev-64 in install-for but not in run-for, so py list --one 3-dev discards these valid listing matches and can print nothing. Rank candidates using the listing match rules rather than requiring a runnable alias for the filter.