Compare selected refs fails if tag object is selected

By mieli... on November 13, 2013 16:59 (imported from Google Code)

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What steps will reproduce the problem?

1. Show log
2. Open ref selection
3. Select two tags (at least one of them must be a tag object)
4. Right-click on the selection
5. Choose "Compare selected refs"

What is the expected output? What do you see instead?
Version field is not populated for a tag object and no difference is shown.

Note that in ref selection box, "Date Last Commit" column is populated for lightweight tags, but is empty for tag objects.

TortoiseGit 1.8.6.0
git version 1.8.4.msysgit.0