How to make gitk not overwrite my selection?

Hi list!

In gitk, whenever I select a commit in the tree, the SHA1 field gets automatically selected, putting its hash into the current selection for easy pasting into other applications. I wonder if I can disable this, because I find it rather annoying; if I do happen to want to paste the hash somewhere, I can easily double click the SHA1 field.

This is specially annoying when I select a hash in xterm and then start gitk to paste it in the SHA1 field. But immediately after gitk opens, it preselects the current HEAD, overwriting my previous selection from xterm.

Generally I think an application should not replace the selection unless the user explicitely marks something. Although I can understand that it can be useful sometimes with gitk. Therefore it should maybe be optional.

Thanks, jlh