da34136de1093e7da9bc10881d11e2f553f4d8d0

In certain configurations (for example when start resolution is set to small value for background render and progressive refine enabled) number of tiles might change in the tile manager. This situation will confuse progressive refine feature and likely cause crash. We might also add some settings verification in the session constructor, but having an assert with brief explanation about what's wrong should already be much better than nothing.
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