Idea: change default ediff-combination-pattern to be compatible with smerge-mode

Idea: change default ediff-combination-pattern to be compatible with smerge-mode

[Christoph Groth]

Hello,

Is there a reason why ediff’s diff markers (for a 3-way-merge with
ancestor) are not compatible with smerge-mode by default?  It turns out
that smerge-mode works well together with ediff-merge if one sets
ediff-combination-pattern to (for example)

("<<<<<<< variant A"
 A
 "||||||| ancestor"
 Ancestor
 "======="
 B
 ">>>>>>> variant B")

The mode smerge-mode provides smerge-refine, which allows to highlight
differences between the ancestor and either variant A or variant B.
This functionality does not seem to be available in ediff but can be
very useful when resolving conflicts.

I know that this is old stuff [1], but perhaps it’s one of those little
things that could be improved with little effort?

Cheers
Christoph

[1] https://gnu.emacs.help.narkive.com/djAhFzov/ediff-merge-ancestor-refinement