Only set viewport or scissor rect if it has changed.
Only set viewport or scissor rect if it has changed.

sereepap2029/playcanvas,guycalledfrank/engine,sereepap2029/playcanvas,playcanvas/engine,H1Gdev/engine,MicroWorldwide/PlayCanvas,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,aidinabedi/playcanvas-engine,sereepap2029/playcanvas,H1Gdev/engine,guycalledfrank/engine,playcanvas/engine