simplify-merges: never remove all TREESAME parents
When simplifying an odd merge, such as one that used "-s ours", we may find ourselves TREESAME to apparently redundant parents. Prevent simplify_merges() from removing every TREESAME parent; if this would happen reinstate the first TREESAME parent - the one that the default log would have followed. This avoids producing a totally disjoint history from the default log when the default log is a better explanation of the end result, and aids visualisation of odd merges. Signed-off-by: NKevin Bracey <kevin@bracey.fi> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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