git-rebase: document suppression of duplicate commits
git-rebase uses format-patch's --ignore-if-in-upstream
option, but we never document the user-visible behavior. The
example is placed near the top of the example list rather
than at the bottom because it is:
a. a simple example
b. a reasonably common scenario for many projects (mail
some patches which get accepted upstream, then rebase)
[sp: Corrected direction of 'HEAD..<upstream>' set comparsion]
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>