Shortcuts for folder comparison: wish to fold all subdirectories (recursively)
In http://meldmerge.org/help/keyboard-shortcuts.html we learn "-" and "+" shortkeys fold and unfold selected directory. I found "Shift +" unfold all subdirectories recursively, but "Shift -" does not fold all of them.
We could also distinguish targeting :
- first level subdirectories with combination "Shift", and
- all level subdirectories with combination "Ctrl Shift", that's recursively.