template: fix shortest(node) function in pure mercurial Pure mercurial (i.e. without c extensions) does not support partialmatch() on the revlog index, so we must fall back to use revlog._partialmatch() to handle that case for us. The tests caught this. We don't use revlog._partialmatch() for the normal case because it performs a very expensive index iteration when the string being tested fails to find a unique result via index.partialmatch(). It does this in order to filter out hidden revs in hopes of the string being unique amongst non-hidden revs. For the shortest(node) case, we'd prefer performance over worrying about hidden revs.