* imap/message.c, muttlib.c, protos.h: Merge full envelope from
message fetch into original sparse envelope, instead of replacing
it. This should be gentler on the various threading hashes and may
* imap/message.c, muttlib.c, protos.h: Merge full envelope from
message fetch into original sparse envelope, instead of replacing
it. This should be gentler on the various threading hashes and may