Add some types to _mathtext.py #30119
Merged
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Mypy 1.16.0 flags errors here:
lib/matplotlib/_mathtext.py:2531: error: "Node" has no attribute "width" [attr-defined]
lib/matplotlib/_mathtext.py:2608: error: List item 0 has incompatible type "Kern"; expected "Hlist | Vlist" [list-item]
The check for the attribute _metrics is equivalent to checking for an
instance of Char, since only Char and its subclasses set self._metrics.
Mypy infers an unnecessarily tight type list[Hlist | Vlist] for
spaced_nucleus so we give it a more general one.