obshistory: omit duplicate notes of obsolescence operations When folding changesets, it's possible to provide a --note flag to e.g. fold or prune, which will store a note for that operation. But since there would be more than one marker for the fold operation and the provided note would be stored in all of them, _markersnotes() previously would return the same text message many times. We don't really want to see the same thing over and over, so let's make notes a set(). This will also make unrelated operations with the same note show the message only once, which is probably an improvement too.

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Enable obsolescence to avoid the warning issue when obsmarkers are found

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  $ cat << EOF >> $HGRCPATH

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  > [experimental]

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  > evolution = all

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  > EOF

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  $ $TESTDIR/../contrib/check-compat-strings.sh "$TESTDIR/../hgext3rd/" "$RUNTESTDIR/.."