Submodule Diff Dialog should launch diff with working copy if the submodule is dirty
By @ch3cooli on December 02, 2012 06:52 (imported from Google Code)
After adding Show Diff button in Submodule Diff Dialog, we can press the button to compare changed files between 2 revisions of submodule.
If the submodule is dirty, it is better to compare working copy of submodule instead of the last checked-out revision.
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