fix(Null exception): View file diff in a patch

[Stelios123]

When the user tried to view a file diff the was an error at the calculation of the modified lines and we were getting null exception in some cases. Fix this bug by adjusting the modifiedLines method and also enable the user to add review comments in both files when viewing the diff.

[github-actions[bot]]

Qodana Community for JVM

6 new problems were found

Inspection name	Severity	Problems
Nullability and data flow problems	🔶 Warning	4
Deprecated API usage	🔶 Warning	1
Unstable API Usage	🔶 Warning	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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