Fist of all, thank you for this great tool!

When I browse through the Commit History and select a .cs file, then select Semantic diff, and then switch the commit, then depending on the file type that is selected gmaster falls back to Text diff. This is correct behavior I guess, but when I switch to the next commit and it is a .cs file again I would have expected that I get the Semantic diff again, but instead I am in text diff mode and have to switch manually.