Creator very slow on some operations when many errors

If there are many errors of certain kinds (not just any errors) in a project at compilation, then creator's code editor is very slow when deleting characters. In such cases, when deleting a character (and also when selecting several characters and deleting them) one of the CPU cores goes to 100% and creator freezes for one or even more seconds (until it eventually deletes the character(s)).

I can reproduce this issue by taking a medium size cpp/h "unit" (600 lines in the cpp file) and changing the return type of a frequently used function (e.g. used some 15+ times in the cpp file), then trying to compile, getting those 15+ error messages (plus a lot more error lines related to these messages), and then:
1) trying to delete a character in the cpp file takes seconds (and one of the CPU cores goes at 100%)
2) double-cliking an error line (reported in the "issues" tab in creator) takes a second or two until the cursor gets positioned on the offending line in the cpp source file (and one of the CPU cores also goes 100% in this case too)

This bug appeared in 3.1.0 (it was not present in Creator 3.0.1)