I'll admit this may have a bit to do with hand-eye coordination issues.
Toad 18.104.22.168 Professional
- Open a table in the schema browser and view the data
- Right click any row and choose Duplicate Row. The new row at this point violates one or more constraints on your table.
- Go to CTRL-V in a value to make the row distinct.
- Instead hit CTRL-F by mistake which opens the find dialogue.
At this point the find dialogue cannot be closed due to the constraint violation and the constraint violation cannot be removed due to the blocking find dialogue. No amount of pressing Esc or other key combinations will clear the problem. No choice but to close Toad via Task Manager and start over.