test-pathencode: randomize length of each path component This makes it possible for long and short components to exist in the same path. This also makes shorter path components more likely. For randint(1, randint(1, n)), the likelihood that one sees a number k (1 <= k <= n) is 1/n * (\sum_{k=i}^n 1/i). This decreases with k, much like in the real world where shorter paths are more common than longer ones. The previous fix and this one together cause issue3958 to be detected by this test with reasonable frequency. When this test was run 100 times in a loop, the issue was detected 30 of those times.

test-pathencode: reduce makepart length requirement by 1 This allows path components of length 1 to be generated.

pathencode: fix hashmangle short dir limit (issue3958) The Python version of this (see mercurial/store.py:_hashencode) copies path components up to a limit of maxshortdirslen bytes. The Python version does not consider the initial "dh/" to be part of the this, though, while the C version currently does. Adding len("dh/") == 3 to the limit for the C version brings it in line with the Python version. This was not caught by the randomized testing scheme in test-pathencode.py because of a couple of flaws with the test. Upcoming patches will fix those problems.

docs: change description to synopsis in hgrc.5 Spotted by Eric S. Raymond.