Fix inheritance logic when intermediate class is present #23

Job	Run time
quality	37s
tests (ubuntu-latest, 3.9, highest)	10s
tests (ubuntu-latest, 3.9, lowest-direct)	14s
tests (ubuntu-latest, 3.10, highest)	10s
tests (ubuntu-latest, 3.10, lowest-direct)	12s
tests (ubuntu-latest, 3.11, highest)	10s
tests (ubuntu-latest, 3.11, lowest-direct)	18s
tests (ubuntu-latest, 3.12, highest)	16s
tests (ubuntu-latest, 3.12, lowest-direct)	13s
tests (ubuntu-latest, 3.13, highest)	21s
tests (ubuntu-latest, 3.13, lowest-direct)	20s
tests (ubuntu-latest, 3.14, highest)	21s
tests (ubuntu-latest, 3.14, lowest-direct)	22s
tests (macos-latest, 3.9, highest)	23s
tests (macos-latest, 3.10, highest)	20s
tests (macos-latest, 3.11, highest)	32s
tests (macos-latest, 3.12, highest)	21s
tests (macos-latest, 3.13, highest)	18s
tests (macos-latest, 3.14, highest)	39s
tests (windows-latest, 3.9, highest)	29s
tests (windows-latest, 3.10, highest)	27s
tests (windows-latest, 3.11, highest)	26s
tests (windows-latest, 3.12, highest)	34s
tests (windows-latest, 3.13, highest)	1m 16s
tests (windows-latest, 3.14, highest)	1m 16s
	10m 45s

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