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Classification:
* Classify octopus merges as unknown, separately
* Classify 2-parent general merges as VanillaMerge, if feature enabled
* Introduce new merged-breakwater commit tag, classify as MergedBreakwaters
* Classify other gdr-generated 2-parent merges as unknown
Inspection (keycommits):
* VanillaMerge commits require laundry, much like dgit imports,
and prevent discernment of the actual breakwater and anchor
Laundry (walk):
* Rewrite VanillaMerge using new merge_series function
Test suite:
* We get a slightly different error message in gdr-unprocessable, now.
Later, when we make this non-experimental all the time, we are going
to have to soup up gdr-unprocessable to make a worse test commit.
There are a lot of known bugs and infelicites, marked with "xxx".
There is a test (which will appear in a moment) but it's rather a poor
test, so there will be many uknown bugs.
So all of this is enabled only if GIT_DEBREBASE_EXPERIMENTAL_MERGE is
set in the environment. (Strictly, only the classification is gated,
but that is sufficient.) No significant functional change without
this setting.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
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