compare/synchronise: can we copy and delete empty folders?

[zhong_qiyao]

Currently, the main windows tree view (View->Tree) is for directory selection.
The synchronise tool (Folder->Synchronise) is file-based.

Can we display empty folders during "Synchronise",
so that we can do in subdirectories:

1. Copy empty folders;

2. Remove empty folders?

This may be related to request 1158:
Make empty folders visible etc.
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