Fix/match display off-by-one error and reenable clustering display

[cyfml]

I fixed the bug: The ends of displayed matches are sometimes off by one and re-enable cluster. It is based on that file path problem is resolved (last PR).
In addition, i added a test case to test cluster.

[sebinside]

Just a reminder from the discussion: Please also fix that the starting line is off by one

[tsaglam]

This PR contains new test resources but no new test case? They are probably from testing and can be removed, right?

[cyfml]

This PR contains new test resources but no new test case? They are probably from testing and can be removed, right?

Yes. After today's classes, i will take a look.

[sebinside]

The code looks okay to me, the match display also seems to work correctly now.

However, we noticed a bug in the ReportGenerator (not your fault, this bug probably existed for a long time). Sometimes, the submission IDs in the array of the cluster's members are serialized as null which breaks everything. I will try to have a look at it next week. If would be good if you could also try to replicate this behavior. Currently, I don't know why this happens.

Example:

{"average_similarity":0.31,"strength":3.72396E-5,"members":["SubmissionA","SubmissionB",null,null,null,null]}

[sebinside]

We found another bug in the report generation, it was fixed with #842. Please rebase your PR so that we can test it again, afterward, it can be merged.

[cyfml]

@sebinside already done.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

87.5% Coverage
0.0% Duplication