Merge with stable

strip: incrementally update the branchheads cache after a strip This function augments strip to incrementally update the branchheads cache rather than recompute it from scratch. This speeds up the performance of strip and rebase on repos with long history. The performance optimization only happens if the revisions stripped are all on the same branch and the parents of the stripped revisions are also on that same branch. This adds a few test cases, particularly one that reproduces the extra heads that mpm observed. [ original upstream message ]

Merge with stable

run-tests: replace inline python handling with more native scheme Normally changes in tests are reported like this in diffs: $ cat foo - a + b Using -i mode lets us update tests when the new results are correct and/or populate tests with their output. But with the standard doctest framework, inline Python sections in tests changes instead result in a big failure report that's unhelpful. So here, we replace the doctest calls with a simple compile/eval loop. [ original upstream message - missed change to heredoctest ]