Fetch Dialog should disable browse ref button

By @ch3cooli on October 06, 2012 14:38 (imported from Google Code)

Currently, only the remote branch combo box is disabled in fetch dialog.
The browse ref button should also be disabled.

What version of TortoiseGit and msysgit are you using? On
what operating system?
TortoiseGit 1.7.13

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