git-completion.bash should not add a space after a ref

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Hi.

This is not really a bug, but a small usability problem.

When completing a reference, Bash will add a space after the reference name.

As an example in:

    $git show master<TAB>

The problem is that an user may want to show a tree or blog object from master:

    $git show master:git.c

A possible solution is to define a new __gitcomp_nospace function and use it where appropriate.

Probably the __gitcomp_nospace should be used when git_complete_file is called, and __gitcomp_nl should be used when __git_complete_revlist is called, but I'm not sure.

P.S.: it seems that __gitcomp_nl is **never** called with 4 arguments.

Regards  Manlio
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