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Commit 1c38777f authored by Steven Stallion's avatar Steven Stallion
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extdiff: add repository root as a variable

Some external diff tools (notably Plan 9 diff(1)) require the absolute path
to the file being diffed for proper function. A root variable was added to
inform an external tool of the repository root (the tool is invoked with the
cwd set to tmproot).
parent 0528b69f
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