scikit-hep / iminuit / 33684052169

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fix: keep parameter names on Matrix sub-selection (#1139)

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A sub-selection of a `Matrix`, such as `m[["a", "b"]]`, `m[:2]` or
`m[[0, 2]]`, kept the `_var2pos` name mapping of the full matrix. The
stale mapping gave wrong labels or an exception in `str()`,
`_repr_html_()`, `to_dict()` and `to_table()`. Slice and iterable
selections now rebuild the mapping from the selected positions. Fancy
indexing that cannot be tracked drops the mapping, and the matrix then
shows positional labels.

This PR was rewritten on top of the current `develop`. It now contains
only this fix; the other fixes from its first version are moved to
separate PRs.

Addresses part of #1132.

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