Getting coverage diff lower then -100%

[miroslavpojer]

Coverage diff counts strange numbers when adding a new file to the project.
v1.6.1

The first diff I can count to confirm.
The second one makes no sense. The file was added in PR so there is missing source data for comparison.
I think you should disable this feature for newly added files and counting only reached coverage.

Here is the second example of the same problem:

Note:

• I am missing the description of how the coverage diff is counted.
• I am missing the switch off of this feature.