Code review comment for lp:~tomasgroth/openlp/mupdf

Ok, here is some more thoughts...
The challenge as I see it is that the presentation plugin has been build around the fact the PowerPoint, PowerPoint Viewer and Impress all have their own "players", which means that since this pdf-presentation extensions is inside the presentation plugin, it is expected to provide a player, which is what I implemented in this first revision by adding the simple PdfViewer class. As some of you noted it might not be a great idea to add another "player", but the problem then is how to bend OpenLP into presenting images, even though it is a presentation...
I've looked around a bit and for now my best idea is to remove my PdfViewer class, and instead use my own instance of the MainDisplay class, which can present images. This way I reuse a "player", and avoid having to hack various parts too much. I haven't tried it yet, but I think it could work.
About python3, that shouldn't be an issue since I call the ghostscript or mupdf programs directly, not via python libs.