Preview multi-page files

[cday]

When a multi-page file is loaded, it is only possible to preview the effect of the actions on the first page, which could sometimes be a significant limitation.

If possible could preview of multi-page files be added, by adding small arrows like those used in the XnView MP viewer to step through the pages of a multi-page file.

As the small arrows would be only an outline until a multi-page file is viewed, and then become active, use should be intuitive...