Validation failures when pre-existing data fails to validate.

While looking at eclipsefdn/helpdesk#4689 (moved) , I tried replicating the reported issue with https://projects.eclipse.org/projects/asciidoc.asciidoc-lang/edit and when I try to save the form(after removing the gerrit repo) I receive a validation error that points me not at the 'source code' section, but rather down at the 'Communication' section and specifically the 'forums', where the following error is visible:

Description cannot be longer than 128 characters but is currently 518 characters long. 

In an ideal universe the validation check would only apply to changed fields, but since that may not be practical I"m not sure what the solution is, aside from maybe maintainers/admins should have a 'yes I know, do it anyway' button to acknowledge the warning and save the changes.

/cc @fgurr