Fix loading of compressed legacy ldb files#2

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tempelmann wants to merge 2 commits intoschriftgestalt:developfrom

tempelmann:develop

Commits on May 6, 2024

Fixes a warning about accessing `self` inside a block.
tempelmann
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Fixes 2 bugs around loading the legacy compressed .ldb files: It deleted the decompressed dir before it could be read, and it left the expanded dir in the tmp location but needs to replace the orig…
tempelmann
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