Display bug in gitk -S

The following applies to git 1.6.4.

I did a "git log -S" with some search term, and it filtered out seven
disconnected commits from a fairly large repository.

Then I tried "gitk -S" with the same term. In the upper pane I briefly
see the seven commits, each with a dot in a different column and a
down-pointing arrow. After a while (presumably when it has searched
through the whole repo and has discovered that the commits are
disconnected), the display is updated to include the preceding commits
as white dots. However, the total number of shown commits is still
restricted to seven, which means that I now only see the first four of
the commits I should see.