penguinolog / urwid / 35195474391

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Fix `Frame.contents.iter()` / `len(Frame.contents)`

`Mapping.keys` is `KeysView` over `Mapping` instance, so we had infinite cycle:
`Frame.contents.keys()` -> `MutableMapping.keys()` -> `Mapping.keys()` -> `KeysView(Frame.contents)` -> `Frame.contents.keys()`

Mass-add tests for Frame

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9743 of 12568 relevant lines covered (77.52%)

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