histedit: don't allow to strip nodes which are necessary to continue histedit
During histedit we don't want user to do any operation resulting in
stripping nodes needed to continue history editing. This patch
wraps the strip function to detect such situations.
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 http://mercurial.selenic.com/ for detailed installation
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