Optionally display Did You Mean search results on existing issues (Feature)

[CKHarwood]

This is something I would like to work on if I can figure out how to do it:

Issues created by email bypass Did You Mean. It could be useful to optionally run the Did You Mean search on existing issues and display the results in the Redmine sidebar or near the Related Issues list. (The sidebar seems less intrusive--I'd rather hide or collapse unnecessary issue details than add new ones!)