How to compare two revisions of a file

I need to compare two revisions of a file, and can't seem to be able to do
it.

Here's what I do:
* Right click on the file > Team > Show History
* This display a list of all revisions in History tab.
* Right click on the topmost revision > Compare ...
* In Compare from, leave Revision: 23866 (current revision), and check the
Compare with HEAD Revision box.
* In Compare from, enter Revision: 23 (first revision ever of that file, 20
or more changes since then over course of 7 years), and check the Compare
with HEAD Revision box.
* Compare type: Graphical
* OK

Eclipse says:
* There are no differences between the selected inputs.

Yet, if I click on the two revisions individually, I see obvious differences
between the two.

Is this a bug, or am I misunderstanding how to use this feature?

Thx.

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