revlog: early return in _slicechunk when span is already small enough If the full span is smaller than the minimum gap size we'll consider, we know we won't do any slicing and we can return earlier.

revlog: early return in _slicechunk when density is already good We don't need to do anything if we know we won't enter the second while loop. Save the overhead of the first loop by returning earlier.

sparse-read: discard gap below 65K only Testing on actual data shows that 65K is more efficient in both time and memory than 256K.

sparse-read: target density of 50% instead of 25% The target density value is wrong. The default target chain span is 4*text-length. However, the target max chain payload is 2*text-length. So default target density should be 50% (2/4) not 25% (1/4).

grep: change default behaviour to search working directory files (BC) With this patch, grep searches on the working directory by default and looks for all files tracked by the working directory and greps on them. ### OLD BEHAVIOUR $ hg init a $ cd a $ echo "some text">>file1 $ hg add file1 $ hg commit -m "adds file1" $ hg mv file1 file2 $ hg grep "some" `file2:1:some text` `file1:0:some text` This behaviour is undesirable since file1 is not in the current history and was renamed as file2, so the second result was redundant and confusing. ### NEW BEHAVIOUR $ hg init a $ cd a $ echo "some text">>file1 $ hg add file1 $ hg commit -m "adds file1" $ hg mv file1 file2 $ hg grep "some" `file2:2147483647:some text` Differential Revision: https://phab.mercurial-scm.org/D3826

patch: don't separate \r and \n when colorizing diff output When displaying diffs, \r at the end of a line is treated as trailing whitespace. This causes an ANSI escape code to be inserted between \r and \n. Some programs, such as less since version 530 (maybe earlier, but at least not version 487) displays ^M when it encounters a lone \r. This causes a lot of noise in diff output on Windows, where \r\n is used to terminate lines. We avoid that by treating both \n and \r\n as end of line when considering trailing whitespace.

hook: add support for disabling the shell to native command translation I think having it on by default is the right thing to do, but this is an escape hatch if someone has a command that shouldn't be mangled. The inspiration is the priority prefix. The translation does nothing on non Windows platforms, so the default value is selected to avoid printing a useless note by default.

hook: narrow the 'priority' prefix check to align with the documentation A prefix like 'priorityfoo' is meaningless, but `hg help config.hooks` calls out the dot.

windows: don't consider '$$' to be an escaped '$' when translating to cmd.exe This functionality was inherited from `os.path.expandvars()`. But the point of adding this translating code is to be able to write a portable hook, and bash wouldn't replace '$$' with '$'. Escaping with '\' works, and is portable.

contrib: add heads(commonancestors(_)) to all-revsets This is mainly to check that we don't regress our optimization path.