Fixed for 2.53.8.1 and up by backporting Bug 1430480
Bug 1720202 Comment 4 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Fixed for 2.53.8.1 and up by backporting Bug 1430480 https://gitlab.com/seamonkey-project/seamonkey-2.53-comm/-/commit/05cbfe6e06043e2230eb2aa78bcfcc49d9e01f46 Fix missing message parts when messages copied manually or filtered. r=jorgk