[FEATURE] Compare 2, View 3

I'm programmatically creating 3 files: file 1 : original data (text lines) file 2 : modified data file 3 : comments

All 3 files have the same number of lines. Files 1 and 2 I want to compare, file 3 just comments/explains why a line in file2 was modified.

So I propose a "Compare 2, View 3 (CCV)" mode, where 2 files are compared, and the 3rd can be used to filter data etc