wireprotoserver: ensure that output stream gets flushed on exception Previously flush was happening due to Python finalizer being run on `BufferedWriter`. With upgrade to Python 3.11 this started randomly failing. My guess is that the finalizer on the raw `FileIO` object may be running before the finalizer of `BufferedWriter` has a chance to run. At any rate, since we're not relying on finalizers in the happy case we should also not rely on them in case of exception.

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skip ignored directories if -i or --all not specified

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  $ hg init t

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  $ cd t

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  $ echo 'ignored' > .hgignore

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  $ hg ci -qA -m init -d'2 0'

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  $ mkdir ignored

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  $ ls

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  ignored

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  $ hg purge -v --no-confirm

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  $ ls

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  ignored