Consider a missing file as a mismatch in compare view
In the :compare view, a missing file is denoted as ....., but it is not considered a mismatch. As such, ]c will skip past them.
This is unfortunate when comparing large directories between which there are only a few differences. If I want to take note of each single aspect in which they differ, I need to scroll the panes carefully enough so that I won't overlook a missing file.
Currently, then, diff -rq is a necessary complement, but I believe making [c catch missing entries would be ideal. Applying CmpMismatch to them also looks appropriate to me.
Seems to make sense, addition/removal is also a change. CmpMismatch sounds less applicable though, mismatch implies two files to differ. Adding CmpAddition/CmpRemoval seems more appropriate (no idea why names differ from Vim here, by the way).