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In file history view, user can select Graphics and Textual view of version differences. If user selects Textual view, and then selects another change in history table, active differences view is reset to Graphics. If user selected any particular view for one history table item, I believe it is fine to assume that is the view user will prefer for other history items too, and it is fine to preserve currently active difference view.
*** This bug has been marked as a duplicate of bug 208540 ***