git: Cannot jump to code from some diffs

1. Have a checkout of qtbase.git.
2. Open a file from qtbase in Creator.
   This is just to point Creator to this repository.
3. From the menu, open "Tools" -> "Git" -> "Actions on Commits...".
4. Paste "f5a58cccc2dad567ddda2fe621f21352781852f0" into the "Change" edit.
5. Click "Show".
   You'll the diff of that change. It doesn't matter whether you use the unified or side-by-side view.
6. Double click on any of the lines in the diff. It doesn't matter whether the line is an actual difference or a line of context.
   A code editor will open showing you the respective line of code.
7. From the menu, open "Tools" -> "Git" -> "Actions on Commits..." again.
8. Paste "6961d46b6e07fc9492c31e5bd8b98660fd65e4e6" into the "Change" edit.
9. Click "Show".
10. Double click on any of the lines in the diff.
    Nothing will happen.

The lines added in the second diff have been removed in the meantime. Still, Creator could jump to the region of code where they were. The context lines did not change at all, so I don't see why Creator cannot jump to those.