The commit message should wrapped at 70 to 100 characters per line. (https://www.mediawiki.org/wiki/Gerrit/Commit_message_guidelines)
Gerrit Patch Uploader uses <textarea cols="75"> with a proportional font for the commit message. This shows a wrapping between about 45 and 150 characters per line on screen. But the submitted message is not wrapped and is in one line.
It would be nice to have an automatic wrapped message. It would be useful when the wrapping is conform to RFC 3676.