history tab does not show the diff controls for a -00 bis draft

`resolution_fixed` `type_defect`   |    by resnick@episteme.net

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The history tab for a -00 bis document should show diff controls with the rfc being bis-ed and the -00 document selected in the From and To controls.

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_Issue migrated from trac:2846 at 2022-03-04 07:37:27 +0000_