Feature Request: "Fit Page" for new pdf output pane

[mnjames]

I like the new built-in pdf output.

But I find 100% zoom to be an odd size. It's quite small, only a couple of inches wide on my screen. (and maybe that default needs fixed)

It would be nice if, next to the zooming dialogue in the lower right, there was also a "fit page" option to automatically make it as big as possible without being trimmed any.