tiny optimization to prevent re-renders from mouse move
tiny optimization to prevent re-renders from mouse move

mikedewar/st-core,mikedewar/st-core,nytlabs/st-core,nikhan/st-core,nytlabs/st-core,mikedewar/st-core,nikhan/st-core,nikhan/st-core,mikedewar/st-core,nikhan/st-core,nytlabs/st-core,nytlabs/st-core