not in series, because they will be deleted. Closes:#904997.
* changelog: Add close note for #905400 to changelog entry for 6.5.
* git-debrebase: convert-from-gbp: Improve messages. Closes:#906641.
+ * git-debrebase: Highly experimental merge resolution support,
+ enabled only with special command line option.
+ * git-debrebase: Check in convert-from-* whether ffq-prev or
+ debrebase-last indicate that we are already in gdr format.
+ * git-debrebase: convert-from-*: leave debrebase-last refs to
+ hint to everyone that this is now a gdr branch.
--