Can't print a Tiled Window

I created a tiled window with File - New - Tiled Window, and dragged two plots into it. Then did “File - Print”.

Expected behavior

Print dialog should appear, and after clicking Print there, a page of little plots should emerge.

Actual behavior

Nothing! No dialog, no printout.

Steps to reproduce the behavior

Platforms affected

Mantid 3.9, Windows

This is still broken in 3.9.2 beta (that Anthony has asked us to test). However I note that the tiled plots created by right clicking on a workspace group and selecting “Tiled plot” do print properly.

Is anyone looking into this?