bug#27453: 25.1; vc/log-view.el log-view-message-re doesn't support newer Darcs log format

[Rohan Hart]

Darcs now shows the internal hash for each patch in a format like:

patch f4128969c4700a0b34414390d04159cb6b11b4e5

Author: bob <bob>

Date:   Sun May 21 22:44:55 NZST 2017

  * patch name

  - further details

Adding the regex "\\|^patch \\(?1:[.0-9a-f]+\\)" to log-view-message-re seems to be sufficient to use the hash.

cheers

Rohan

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