Selecting a "Diff" first (Add) must open the diagram on both sides.
tree091815c37868d3d92edd0eeb2bdb6c3cd6ab2cce
-rw-r--r-- 27 .gitignore
drwxr-xr-x - org.eclipse.emf.compare-parent
drwxr-xr-x - packaging
drwxr-xr-x - plugins