I've read a few other issues about trying to prevent labels from rendering if they run off the edge of the map canvas. This is particularly a problem in Composer, where I get lots of country labels which are only half on the page.
In the above post in the QGIS issue queue, Nyall Dawson says "There's an option in the global label settings to prevent clipped labels at the edge of maps".
I can't find this setting. Does anyone know where it is? Or any other solution for this problem?