I think it would be really helpful (especially for newbies like me) to
have an option like

git diff --gui [revisions] <singe path spec>

to fire up a graphical diff viewer (similar to what git-mergetool does).

Another good place to start a graphical diff from is probably gitk from
a context-menu for the changed files in the lower right pane.

Thoughts?

-- 
best regards

  Ray

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