Fix patch creating facility for the HEAD version

By lpapp.b... on May 14, 2010 12:05 (imported from Google Code)

Hello Frank,

I can't do a patch from the HEAD version (last commit.) with range choosing
facility.

So basically if you choose some earlier commit into tbe 'From' box, and you
choose the HEAD commit into the 'To' box, it will generate the desired
patch files until HEAD commit which isn't generated.

The solution can't be that to choose the Working dir changes in the dialog
because it hasn't index, commit hash first of all, secondly if I choose it
right now it generates simply 0 digits to there.

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