It is for using the chosen level to be used instead of the standard blurred preview. I wanted to force loading the entire level one before loading other levels of tiles. This does this but doing this allows for some background to be seen as the tiles are loading ( on a slow connection anyway ). I plan to test on various speeds to determine if it functions well enough to not use the standard preview.
Just testing new functions as I find them.
Ps. Klaus, do you still have the docs from 1.0.7 available for viewing? Perhaps those examples can still help (help me, at least).