Description of problem:
Rsync famously distinguishes between a trailing slash in source directory names compared to without the slash.  When using bash-completion however, the completion ignores that a directory name without a trailing slash is a distinctly valid candidate.  It would be very useful if the completion for rsync can make this distinction.

Version-Release number of selected component (if applicable):
all

How reproducible:
always

Steps to Reproduce:
1. Create a test directory structure
   $ mkdir -p foo{1,2}
   $ touch foo{1,2}/{bar,baz}
2. Try to complete with foo1 as source, and foo2 as destination

Actual results:
$ rsync -r foo [TAB] [TAB]
foo1/  foo2/

$ rsync -r foo1 [TAB]
$ rsync -r foo1/

Expected results:
Since in the first case foo1, foo1/, foo2, foo2/, and in the second case foo1 and foo1/, are distinctly different candidates, I propose bash-completion for rsync distinguish between them.

$ rsync -r foo [TAB] [TAB]
foo1  foo1/  foo2  foo2/

$ rsync -r foo1 [TAB]
foo1  foo1/

Additional info:
I realise this request is probably not easy, and has the potential to lead to messy code.  But having it would be a great enhancement for rsync users, specially novices, and experienced users with a faltering mind ;).