fix parsing of tags. make parse errors useful. add new tag tests. old code read every head of .hgtags. delete and recreate of .hgtags gave new head, but if error in deleted rev, .hgtags had error messages every time it was parsed. this was very hard to fix, because deleted revs hard to get back and update, needed merges too. new code reads .hgtags on every head. advantage is if parse error happens with new code, is possible to fix them by editing .hgtags on a head and committing. NOTE: new code uses binary search of manifest of each head to be fast, but still much slower than old code. best thing would be to have delete record stored in filelog so we never touch manifest. could find live heads directly from filelog. this is more work than i want now. new tests check for parse of tags on different heads, and inaccessible heads created by delete and recreate of .hgtags.

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#!/bin/sh

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hg init

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touch a

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hg add a

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hg commit -m "Added a" -d "1000000 0"

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touch main

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hg add main

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hg commit -m "Added main" -d "1000000 0"

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hg checkout 0

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echo Main should be gone

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ls

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touch side1

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hg add side1

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hg commit -m "Added side1" -d "1000000 0"

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touch side2

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hg add side2

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hg commit -m "Added side2" -d "1000000 0"

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hg log

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echo Should have two heads, side2 and main

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hg heads

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echo Should show "a side1 side2"

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ls

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hg update --debug -C 1

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echo Should only show "a main"

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ls

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