it means a slide in impress.

commit 7b31e45e
Date:   Mon Jun 23 20:55:21 2014 +0100
    Make Draw use paper size when printing - fdo#63905

    Previously, Draw/Impress use the default size from the printer.
    Now Draw uses the paper size (specified in page formatting).
    Impress still uses the old method - not sure if this is correct
    but printing handouts etc probably complicate print/paper size.

suggests the intent is for this to not affect Impress and to only
affect Draw, so this does that

Change-Id: I481a824ef244fd837992c893f6de0c051af0a26b