dirstate: fix rebuild; add a test
If rebuild calls invalidate, it will just queue a (re)read of the dirstate
file, while what we really want is to empty the current state.
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Should display 'First commit message'
description:
First commit message
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Should display 'Second commit message'
description:
Second commit message
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Should display 'Third commit message\n This is the 3rd log message'
description:
Third commit message
This is the 3rd log message
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Should display 'Fifth commit message\n This is the 5th log message'
description:
Fifth commit message