Meld no longer compares with CVS Repository
Earlier versions of meld were comparing with the CVS repository, when using meld with files in a CVS.
In Version 3.16.3-1 (Ubuntu: yakkety/universe) this is no longer the case, i.e. the comparison reports 'Files are identical' using the file in the local folder comparing it with itself.
This has been filed with Ubuntu 3 years ago. Please find more information on: https://bugs.launchpad.net/ubuntu/+source/meld/+bug/1647354