Description of problem: I don't know about you, but I sure as heck get easily irritated about getting a crash reported more than once. I agree that a report could contain differences, but the duplicates doesn't.

Steps to Reproduce:
1. Create a program crash.
2. Wait for the window telling you to add further information before proceeding.
3. If this is a problem already reported by someone else, make that window check if this crash has already been reported.
4. If it is reported, just have an option to choose "Crash already reported" and then just exit the window normally by clicking on the X.