Maximum resolution on image export

[AlexBuchner]

When exporting my map as an image file, there appears to be a maximum allowable resolution of 8192 x 8192 pixels regardless of the size of the map. This is causing issues for me on a 2300+ room map, as when you zoom in to see the name of the room text, it's no longer readable - not enough pixels available to render it!

Attached is sample output at 100% resolution for the map I'm working on.