mdiff: add a "blocksinrange" function to filter diff blocks by line range
The function filters diff blocks as generated by mdiff.allblock function based
on whether they are contained in a given line range based on the "b-side" of
blocks.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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Running without installing:
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See https://mercurial-scm.org/ for detailed installation
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