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The Header and Footer, Watermark and Background dialogs drew their preview on a blank sheet, so you could not see where the marks would land on the page's text and pictures. The preview now paints the page's own thumbnail, rendered off the UI thread like the pages panel's, with a blank sheet until it arrives. It shows the current page when the page range selects it, otherwise the first page the range selects, at its displayed size (after /Rotate), which is the frame the engine lays the marks out in. A background colour tints the page picture instead of covering it, as a background behind the content looks. Fixes #2837.