Summary:
This feature allows the user to choose what lines exist in what changesets
precisely, for example:
HG: editing a
HG: "y" means the line to the right exists in the changeset to the top
HG:
HG: /---- 991104c93ef1 commit 1
HG: |/--- aa7e21df9b0b commit 2
HG: ||/-- 05b39f5d9141 commit 3
HG: |||
yyy : 1
yy : 2
y : 3
The feature can be used to "move" lines among changesets, or generally
editing the contents in a new way. So it's not limited in the "absorb"
use-case. We may want to give it another name in the future.
Test Plan: Added a new test case
Reviewers: #mercurial, rmcelroy, ttung
Reviewed By: rmcelroy
Subscribers: rmcelroy, mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D3841494
Signature: t1:3841494:1473769708:1bb2a46c010222438ceaae69ea0dca39e37581d2
