Bugzilla attachments' filename are encoded using MIME-Q RFC2047 format which is not supported by Safari. This surfaced to become an issue after bugs.webkit.org was migrated to EL8 platform. Previously the encoding did not work and filenames were added to the content-disposition header unchanged.
<rdar://problem/108480543>
This was first corrected in https://github.com/bugzilla/harmony/commit/557410f34c224543c0afb8686f995fca3297bc68 . The current change is based on https://github.com/bugzilla/harmony/blob/main/attachment.cgi Tested on Safari, Firefox, Chrome and Opera.
Pull request: https://github.com/WebKit/WebKit/pull/13169
Committed 263422@main (05c3544024ad): <https://commits.webkit.org/263422@main> Reviewed commits have been landed. Closing PR #13169 and removing active labels.