Rearrange code in ScrollbarPair set so that all the getAttribute calls come before all of the setAttribute calls.  This gets rid of an unnecessary layout pass on mouseMove events.
Rearrange code in ScrollbarPair set so that all the getAttribute
calls come before all of the setAttribute calls.  This gets rid
of an unnecessary layout pass on mouseMove events.

sclements/scratch-blocks,trodi/blockly,ralic/blockly,gupta137/blockly,mark-friedman/blockly,twodee/blockly,picklesrus/blockly,rachel-fenichel/blockly,drigz/blockly,sclements/scratch-blocks,nickmain/blockly,groklearning/blockly,lzairdking/blockly,cmillani/blockly,OpenRoberta/blockly,ralic/blockly,LLK/scratch-blocks,OpenRoberta/blockly,CocoMake7/CocoBlockly,stefan-j/blockly,dhalupa/blockly,stefan-j/blockly,aravart/speech-blocks,edbutler/blockly,LLK/scratch-blocks,markocelan/blockly-minecraft,nickmain/blockly,mark-friedman/blockly,carlosperate/ardublockly,sclements/scratch-blocks,TechplexEngineer/blockly,RealTimeWeb/blockly,picklesrus/blockly,joshlory/blockly,nickmain/blockly,rachel-fenichel/blockly,carlosperate/blockly,dhalupa/blockly,cmillani/blockly,trodi/blockly,daarond/blockly,jano42/blockly,daarond/blockly,twodee/blockly,gengshenghong/scratch-blocks,mark-friedman/blockly,marianoguerra/blockly,jstnhuang/blockly,trodi/blockly,google/blockly,markocelan/blockly-minecraft,drigz/blockly,joshlory/blockly,carloslfu/blockly,jano42/blockly,hkoi/blockly,gupta137/blockly,joshlory/blockly,dhalupa/blockly,hkoi/blockly,mark-friedman/blockly,nickmain/blockly,groklearning/blockly,twodee/blockly,markocelan/blockly-minecraft,gengshenghong/scratch-blocks,lzairdking/blockly,google/blockly,sclements/scratch-blocks,LLK/scratch-blocks,drigz/blockly,carlosperate/blockly,hkoi/blockly,groklearning/blockly,google/blockly,daarond/blockly,jstnhuang/blockly,aravart/speech-blocks,edbutler/blockly,nickmain/blockly,carloslfu/blockly,carlosperate/ardublockly,LLK/scratch-blocks,rachel-fenichel/blockly,stefan-j/blockly,mark-friedman/blockly,griffpatch/scratch-blocks,twodee/blockly,trinketapp/blockly,jano42/blockly,google/blockly,marianoguerra/blockly,trinketapp/blockly,trinketapp/blockly,OpenRoberta/blockly,stefan-j/blockly,LLK/scratch-blocks,trodi/blockly,griffpatch/scratch-blocks,google/blockly-devtools,google/blockly-devtools,lzairdking/blockly,mark-friedman/blockly,CocoMake7/CocoBlockly,griffpatch/scratch-blocks,carlosperate/blockly,rachel-fenichel/blockly,RealTimeWeb/blockly,marianoguerra/blockly,gengshenghong/scratch-blocks,carlosperate/ardublockly,trinketapp/blockly,edbutler/blockly,RealTimeWeb/blockly,gengshenghong/scratch-blocks,carlosperate/blockly,gengshenghong/scratch-blocks,jstnhuang/blockly,twodee/blockly,ralic/blockly,carloslfu/blockly,sclements/scratch-blocks,lzairdking/blockly,InspectorWidget/blockly,gupta137/blockly,jano42/blockly,picklesrus/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,TechplexEngineer/blockly,griffpatch/scratch-blocks,nickmain/blockly,InspectorWidget/blockly,jstnhuang/blockly,groklearning/blockly,rachel-fenichel/blockly,markocelan/blockly-minecraft,OpenRoberta/blockly,google/blockly,InspectorWidget/blockly,twodee/blockly,griffpatch/scratch-blocks,rachel-fenichel/blockly,CocoMake7/CocoBlockly,cmillani/blockly