diff --git a/blockly_compressed.js b/blockly_compressed.js
index 2937a552..bb8ae09d 100644
--- a/blockly_compressed.js
+++ b/blockly_compressed.js
@@ -857,8 +857,9 @@ Blockly.Workspace.prototype.getWidth=function(){return 0};Blockly.Workspace.prot
 "mousedown",this,this.bubbleMouseDown_),this.resizeGroup_&&Blockly.bindEvent_(this.resizeGroup_,"mousedown",this,this.resizeMouseDown_))};Blockly.Bubble.BORDER_WIDTH=6;Blockly.Bubble.ARROW_THICKNESS=10;Blockly.Bubble.ARROW_ANGLE=20;Blockly.Bubble.ARROW_BEND=4;Blockly.Bubble.ANCHOR_RADIUS=8;Blockly.Bubble.onMouseUpWrapper_=null;Blockly.Bubble.onMouseMoveWrapper_=null;
 Blockly.Bubble.unbindDragEvents_=function(){Blockly.Bubble.onMouseUpWrapper_&&(Blockly.unbindEvent_(Blockly.Bubble.onMouseUpWrapper_),Blockly.Bubble.onMouseUpWrapper_=null);Blockly.Bubble.onMouseMoveWrapper_&&(Blockly.unbindEvent_(Blockly.Bubble.onMouseMoveWrapper_),Blockly.Bubble.onMouseMoveWrapper_=null)};Blockly.Bubble.prototype.rendered_=!1;Blockly.Bubble.prototype.anchorX_=0;Blockly.Bubble.prototype.anchorY_=0;Blockly.Bubble.prototype.relativeLeft_=0;Blockly.Bubble.prototype.relativeTop_=0;
 Blockly.Bubble.prototype.width_=0;Blockly.Bubble.prototype.height_=0;Blockly.Bubble.prototype.autoLayout_=!0;
-Blockly.Bubble.prototype.createDom_=function(a,b){this.bubbleGroup_=Blockly.createSvgElement("g",{},null);var c={filter:"url(#blocklyEmboss)"};-1!=goog.userAgent.getUserAgentString().indexOf("JavaFX")&&(c={});c=Blockly.createSvgElement("g",c,this.bubbleGroup_);this.bubbleArrow_=Blockly.createSvgElement("path",{},c);this.bubbleBack_=Blockly.createSvgElement("rect",{"class":"blocklyDraggable",x:0,y:0,rx:Blockly.Bubble.BORDER_WIDTH,ry:Blockly.Bubble.BORDER_WIDTH},c);b?(this.resizeGroup_=Blockly.createSvgElement("g",
-{"class":this.workspace_.RTL?"blocklyResizeSW":"blocklyResizeSE"},this.bubbleGroup_),c=2*Blockly.Bubble.BORDER_WIDTH,Blockly.createSvgElement("polygon",{points:"0,x x,x x,0".replace(/x/g,c.toString())},this.resizeGroup_),Blockly.createSvgElement("line",{"class":"blocklyResizeLine",x1:c/3,y1:c-1,x2:c-1,y2:c/3},this.resizeGroup_),Blockly.createSvgElement("line",{"class":"blocklyResizeLine",x1:2*c/3,y1:c-1,x2:c-1,y2:2*c/3},this.resizeGroup_)):this.resizeGroup_=null;this.bubbleGroup_.appendChild(a);return this.bubbleGroup_};
+Blockly.Bubble.prototype.createDom_=function(a,b){this.bubbleGroup_=Blockly.createSvgElement("g",{},null);var c={filter:"url(#"+this.workspace_.options.embossFilterId+")"};-1!=goog.userAgent.getUserAgentString().indexOf("JavaFX")&&(c={});c=Blockly.createSvgElement("g",c,this.bubbleGroup_);this.bubbleArrow_=Blockly.createSvgElement("path",{},c);this.bubbleBack_=Blockly.createSvgElement("rect",{"class":"blocklyDraggable",x:0,y:0,rx:Blockly.Bubble.BORDER_WIDTH,ry:Blockly.Bubble.BORDER_WIDTH},c);b?(this.resizeGroup_=
+Blockly.createSvgElement("g",{"class":this.workspace_.RTL?"blocklyResizeSW":"blocklyResizeSE"},this.bubbleGroup_),c=2*Blockly.Bubble.BORDER_WIDTH,Blockly.createSvgElement("polygon",{points:"0,x x,x x,0".replace(/x/g,c.toString())},this.resizeGroup_),Blockly.createSvgElement("line",{"class":"blocklyResizeLine",x1:c/3,y1:c-1,x2:c-1,y2:c/3},this.resizeGroup_),Blockly.createSvgElement("line",{"class":"blocklyResizeLine",x1:2*c/3,y1:c-1,x2:c-1,y2:2*c/3},this.resizeGroup_)):this.resizeGroup_=null;this.bubbleGroup_.appendChild(a);
+return this.bubbleGroup_};
 Blockly.Bubble.prototype.bubbleMouseDown_=function(a){this.promote_();Blockly.Bubble.unbindDragEvents_();Blockly.isRightButton(a)?a.stopPropagation():Blockly.isTargetInput_(a)||(Blockly.Css.setCursor(Blockly.Css.Cursor.CLOSED),this.workspace_.startDrag(a,this.workspace_.RTL?-this.relativeLeft_:this.relativeLeft_,this.relativeTop_),Blockly.Bubble.onMouseUpWrapper_=Blockly.bindEvent_(document,"mouseup",this,Blockly.Bubble.unbindDragEvents_),Blockly.Bubble.onMouseMoveWrapper_=Blockly.bindEvent_(document,
 "mousemove",this,this.bubbleMouseMove_),Blockly.hideChaff(),a.stopPropagation())};Blockly.Bubble.prototype.bubbleMouseMove_=function(a){this.autoLayout_=!1;a=this.workspace_.moveDrag(a);this.relativeLeft_=this.workspace_.RTL?-a.x:a.x;this.relativeTop_=a.y;this.positionBubble_();this.renderArrow_()};
 Blockly.Bubble.prototype.resizeMouseDown_=function(a){this.promote_();Blockly.Bubble.unbindDragEvents_();Blockly.isRightButton(a)||(Blockly.Css.setCursor(Blockly.Css.Cursor.CLOSED),this.workspace_.startDrag(a,this.workspace_.RTL?-this.width_:this.width_,this.height_),Blockly.Bubble.onMouseUpWrapper_=Blockly.bindEvent_(document,"mouseup",this,Blockly.Bubble.unbindDragEvents_),Blockly.Bubble.onMouseMoveWrapper_=Blockly.bindEvent_(document,"mousemove",this,this.resizeMouseMove_),Blockly.hideChaff());
@@ -871,7 +872,7 @@ Blockly.Bubble.prototype.setBubbleSize=function(a,b){var c=2*Blockly.Bubble.BORD
 this.layoutBubble_(),this.positionBubble_(),this.renderArrow_());Blockly.fireUiEvent(this.bubbleGroup_,"resize")};
 Blockly.Bubble.prototype.renderArrow_=function(){var a=[],b=this.width_/2,c=this.height_/2,d=-this.relativeLeft_,e=-this.relativeTop_;if(b==d&&c==e)a.push("M "+b+","+c);else{e-=c;d-=b;this.workspace_.RTL&&(d*=-1);var f=Math.sqrt(e*e+d*d),g=Math.acos(d/f);0>e&&(g=2*Math.PI-g);var h=g+Math.PI/2;h>2*Math.PI&&(h-=2*Math.PI);var k=Math.sin(h),l=Math.cos(h),q=this.getBubbleSize(),h=(q.width+q.height)/Blockly.Bubble.ARROW_THICKNESS,h=Math.min(h,q.width,q.height)/2,q=1-Blockly.Bubble.ANCHOR_RADIUS/f,d=b+
 q*d,e=c+q*e,q=b+h*l,m=c+h*k,b=b-h*l,c=c-h*k,k=g+this.arrow_radians_;k>2*Math.PI&&(k-=2*Math.PI);g=Math.sin(k)*f/Blockly.Bubble.ARROW_BEND;f=Math.cos(k)*f/Blockly.Bubble.ARROW_BEND;a.push("M"+q+","+m);a.push("C"+(q+f)+","+(m+g)+" "+d+","+e+" "+d+","+e);a.push("C"+d+","+e+" "+(b+f)+","+(c+g)+" "+b+","+c)}a.push("z");this.bubbleArrow_.setAttribute("d",a.join(" "))};Blockly.Bubble.prototype.setColour=function(a){this.bubbleBack_.setAttribute("fill",a);this.bubbleArrow_.setAttribute("fill",a)};
-Blockly.Bubble.prototype.dispose=function(){Blockly.Bubble.unbindDragEvents_();goog.dom.removeNode(this.bubbleGroup_);this.shape_=this.content_=this.workspace_=this.bubbleGroup_=null};Blockly.Icon=function(a){this.block_=a};Blockly.Icon.prototype.collapseHidden=!0;Blockly.Icon.prototype.SIZE=17;Blockly.Icon.prototype.png_="";Blockly.Icon.prototype.bubble_=null;Blockly.Icon.prototype.iconX_=0;Blockly.Icon.prototype.iconY_=0;
+Blockly.Bubble.prototype.dispose=function(){Blockly.Bubble.unbindDragEvents_();goog.dom.removeNode(this.bubbleGroup_);this.shape_=this.content_=this.workspace_=this.resizeGroup_=this.bubbleBack_=this.bubbleArrow_=this.bubbleGroup_=null};Blockly.Icon=function(a){this.block_=a};Blockly.Icon.prototype.collapseHidden=!0;Blockly.Icon.prototype.SIZE=17;Blockly.Icon.prototype.png_="";Blockly.Icon.prototype.bubble_=null;Blockly.Icon.prototype.iconX_=0;Blockly.Icon.prototype.iconY_=0;
 Blockly.Icon.prototype.createIcon=function(){this.iconGroup_||(this.iconGroup_=Blockly.createSvgElement("g",{"class":"blocklyIconGroup"},null),Blockly.createSvgElement("image",{width:this.SIZE,height:this.SIZE},this.iconGroup_).setAttributeNS("http://www.w3.org/1999/xlink","xlink:href",this.png_),this.block_.getSvgRoot().appendChild(this.iconGroup_),Blockly.bindEvent_(this.iconGroup_,"mouseup",this,this.iconClick_),this.updateEditable())};
 Blockly.Icon.prototype.dispose=function(){goog.dom.removeNode(this.iconGroup_);this.iconGroup_=null;this.setVisible(!1);this.block_=null};Blockly.Icon.prototype.updateEditable=function(){this.block_.isInFlyout||!this.block_.isEditable()?Blockly.addClass_(this.iconGroup_,"blocklyIconGroupReadonly"):Blockly.removeClass_(this.iconGroup_,"blocklyIconGroupReadonly")};Blockly.Icon.prototype.isVisible=function(){return!!this.bubble_};
 Blockly.Icon.prototype.iconClick_=function(a){2!=Blockly.dragMode_&&(this.block_.isInFlyout||Blockly.isRightButton(a)||this.setVisible(!this.isVisible()))};Blockly.Icon.prototype.updateColour=function(){if(this.isVisible()){var a=Blockly.makeColour(this.block_.getColour());this.bubble_.setColour(a)}};
@@ -1107,7 +1108,7 @@ Blockly.BlockSvg.prototype.disconnectUiEffect=function(){this.workspace.playAudi
 Blockly.BlockSvg.disconnectUiStep_=function(a,b,c){var d=(new Date-c)/200;1<d?a.skew_="":(a.skew_="skewX("+Math.round(Math.sin(d*Math.PI*3)*(1-d)*b)+")",Blockly.BlockSvg.disconnectUiStop_.group=a,Blockly.BlockSvg.disconnectUiStop_.pid=setTimeout(function(){Blockly.BlockSvg.disconnectUiStep_(a,b,c)},10));a.setAttribute("transform",a.translate_+a.skew_)};
 Blockly.BlockSvg.disconnectUiStop_=function(){if(Blockly.BlockSvg.disconnectUiStop_.group){clearTimeout(Blockly.BlockSvg.disconnectUiStop_.pid);var a=Blockly.BlockSvg.disconnectUiStop_.group;a.skew_="";a.setAttribute("transform",a.translate_);Blockly.BlockSvg.disconnectUiStop_.group=null}};Blockly.BlockSvg.disconnectUiStop_.pid=0;Blockly.BlockSvg.disconnectUiStop_.group=null;
 Blockly.BlockSvg.prototype.updateColour=function(){if(!this.disabled){var a=Blockly.makeColour(this.getColour()),b=goog.color.hexToRgb(a),c=goog.color.lighten(b,.3),b=goog.color.darken(b,.2);this.svgPathLight_.setAttribute("stroke",goog.color.rgbArrayToHex(c));this.svgPathDark_.setAttribute("fill",goog.color.rgbArrayToHex(b));this.svgPath_.setAttribute("fill",a);a=this.getIcons();for(c=0;c<a.length;c++)a[c].updateColour();for(a=0;c=this.inputList[a];a++)for(var b=0,d;d=c.fieldRow[b];b++)d.setText(null)}};
-Blockly.BlockSvg.prototype.updateDisabled=function(){var a=Blockly.hasClass_(this.svgGroup_,"blocklyDisabled");this.disabled||this.getInheritedDisabled()?a||(Blockly.addClass_(this.svgGroup_,"blocklyDisabled"),this.svgPath_.setAttribute("fill","url(#blocklyDisabledPattern)")):a&&(Blockly.removeClass_(this.svgGroup_,"blocklyDisabled"),this.updateColour());for(var a=this.getChildren(),b=0,c;c=a[b];b++)c.updateDisabled()};
+Blockly.BlockSvg.prototype.updateDisabled=function(){var a=Blockly.hasClass_(this.svgGroup_,"blocklyDisabled");this.disabled||this.getInheritedDisabled()?a||(Blockly.addClass_(this.svgGroup_,"blocklyDisabled"),this.svgPath_.setAttribute("fill","url(#"+this.workspace.options.disabledPatternId+")")):a&&(Blockly.removeClass_(this.svgGroup_,"blocklyDisabled"),this.updateColour());for(var a=this.getChildren(),b=0,c;c=a[b];b++)c.updateDisabled()};
 Blockly.BlockSvg.prototype.getCommentText=function(){return this.comment?this.comment.getText().replace(/\s+$/,"").replace(/ +\n/g,"\n"):""};Blockly.BlockSvg.prototype.setCommentText=function(a){var b=!1;goog.isString(a)?(this.comment||(this.comment=new Blockly.Comment(this),b=!0),this.comment.setText(a)):this.comment&&(this.comment.dispose(),b=!0);b&&this.rendered&&(this.render(),this.bumpNeighbours_())};
 Blockly.BlockSvg.prototype.setWarningText=function(a,b){this.setWarningText.pid_||(this.setWarningText.pid_=Object.create(null));var c=b||"";if(c)this.setWarningText.pid_[c]&&(clearTimeout(this.setWarningText.pid_[c]),delete this.setWarningText.pid_[c]);else for(var d in this.setWarningText.pid_)clearTimeout(this.setWarningText.pid_[d]),delete this.setWarningText.pid_[d];if(2==Blockly.dragMode_){var e=this;this.setWarningText.pid_[c]=setTimeout(function(){e.workspace&&(delete e.setWarningText.pid_[c],
 e.setWarningText(a,c))},100)}else{this.isInFlyout&&(a=null);d=this.getSurroundParent();for(var f=null;d;)d.isCollapsed()&&(f=d),d=d.getSurroundParent();f&&f.setWarningText(a,"collapsed "+this.id+" "+c);d=!1;goog.isString(a)?(this.warning||(this.warning=new Blockly.Warning(this),d=!0),this.warning.setText(a,c)):this.warning&&!c?(this.warning.dispose(),d=!0):this.warning&&(d=this.warning.getText(),this.warning.setText("",c),(f=this.warning.getText())||this.warning.dispose(),d=d==f);d&&this.rendered&&
@@ -1258,10 +1259,10 @@ return d};Blockly.parseToolboxTree_=function(a){a?("string"!=typeof a&&"undefine
 Blockly.parseOptions_=function(a){var b=!!a.readOnly;if(b)var c=null,d=!1,e=!1,f=!1,g=!1,h=!1,k=!1;else c=Blockly.parseToolboxTree_(a.toolbox),d=Boolean(c&&c.getElementsByTagName("category").length),e=a.trashcan,void 0===e&&(e=d),f=a.collapse,void 0===f&&(f=d),g=a.comments,void 0===g&&(g=d),h=a.disable,void 0===h&&(h=d),k=a.sounds,void 0===k&&(k=!0);var l=a.scrollbars;void 0===l&&(l=d);var q=a.css;void 0===q&&(q=!0);var m=a.grid||{},p={};p.spacing=parseFloat(m.spacing)||0;p.colour=m.colour||"#888";
 p.length=parseFloat(m.length)||1;p.snap=0<p.spacing&&!!m.snap;m="https://blockly-demo.appspot.com/static/media/";a.media?m=a.media:a.path&&(m=a.path+"media/");var n=a.zoom||{},r={};r.enabled=l&&!!n.enabled;r.enabled?(r.controls=void 0===n.controls?!0:!!n.controls,r.wheel=void 0===n.wheel?!0:!!n.wheel,r.maxScale=void 0===n.maxScale?3:parseFloat(n.maxScale),r.minScale=void 0===n.minScale?.3:parseFloat(n.minScale),r.scaleSpeed=void 0===n.scaleSpeed?1.2:parseFloat(n.scaleSpeed)):(r.controls=!1,r.wheel=
 !1);n=!!a.realtime;return{RTL:!!a.rtl,collapse:f,comments:g,disable:h,readOnly:b,maxBlocks:a.maxBlocks||Infinity,pathToMedia:m,hasCategories:d,hasScrollbars:l,hasTrashcan:e,hasSounds:k,hasCss:q,languageTree:c,gridOptions:p,zoomOptions:r,enableRealtime:n,realtimeOptions:n?a.realtimeOptions:void 0}};
-Blockly.createDom_=function(a,b){a.setAttribute("dir","LTR");goog.ui.Component.setDefaultRightToLeft(b.RTL);Blockly.Css.inject(b.hasCss,b.pathToMedia);var c=Blockly.createSvgElement("svg",{xmlns:"http://www.w3.org/2000/svg","xmlns:html":"http://www.w3.org/1999/xhtml","xmlns:xlink":"http://www.w3.org/1999/xlink",version:"1.1","class":"blocklySvg"},a),d=Blockly.createSvgElement("defs",{},c),e,f;e=Blockly.createSvgElement("filter",{id:"blocklyEmboss"},d);Blockly.createSvgElement("feGaussianBlur",{"in":"SourceAlpha",
-stdDeviation:1,result:"blur"},e);f=Blockly.createSvgElement("feSpecularLighting",{"in":"blur",surfaceScale:1,specularConstant:.5,specularExponent:10,"lighting-color":"white",result:"specOut"},e);Blockly.createSvgElement("fePointLight",{x:-5E3,y:-1E4,z:2E4},f);Blockly.createSvgElement("feComposite",{"in":"specOut",in2:"SourceAlpha",operator:"in",result:"specOut"},e);Blockly.createSvgElement("feComposite",{"in":"SourceGraphic",in2:"specOut",operator:"arithmetic",k1:0,k2:1,k3:1,k4:0},e);e=Blockly.createSvgElement("filter",
-{id:"blocklyShadowFilter"},d);Blockly.createSvgElement("feGaussianBlur",{stdDeviation:2},e);e=Blockly.createSvgElement("pattern",{id:"blocklyDisabledPattern",patternUnits:"userSpaceOnUse",width:10,height:10},d);Blockly.createSvgElement("rect",{width:10,height:10,fill:"#aaa"},e);Blockly.createSvgElement("path",{d:"M 0 0 L 10 10 M 10 0 L 0 10",stroke:"#cc0"},e);d=Blockly.createSvgElement("pattern",{id:"blocklyGridPattern"+String(Math.random()).substring(2),patternUnits:"userSpaceOnUse"},d);0<b.gridOptions.length&&
-0<b.gridOptions.spacing&&(Blockly.createSvgElement("line",{stroke:b.gridOptions.colour},d),1<b.gridOptions.length&&Blockly.createSvgElement("line",{stroke:b.gridOptions.colour},d));b.gridPattern=d;return b.svg=c};
+Blockly.createDom_=function(a,b){a.setAttribute("dir","LTR");goog.ui.Component.setDefaultRightToLeft(b.RTL);Blockly.Css.inject(b.hasCss,b.pathToMedia);var c=Blockly.createSvgElement("svg",{xmlns:"http://www.w3.org/2000/svg","xmlns:html":"http://www.w3.org/1999/xhtml","xmlns:xlink":"http://www.w3.org/1999/xlink",version:"1.1","class":"blocklySvg"},a),d=Blockly.createSvgElement("defs",{},c),e=String(Math.random()).substring(2),f=Blockly.createSvgElement("filter",{id:"blocklyEmbossFilter"+e},d);Blockly.createSvgElement("feGaussianBlur",
+{"in":"SourceAlpha",stdDeviation:1,result:"blur"},f);var g=Blockly.createSvgElement("feSpecularLighting",{"in":"blur",surfaceScale:1,specularConstant:.5,specularExponent:10,"lighting-color":"white",result:"specOut"},f);Blockly.createSvgElement("fePointLight",{x:-5E3,y:-1E4,z:2E4},g);Blockly.createSvgElement("feComposite",{"in":"specOut",in2:"SourceAlpha",operator:"in",result:"specOut"},f);Blockly.createSvgElement("feComposite",{"in":"SourceGraphic",in2:"specOut",operator:"arithmetic",k1:0,k2:1,k3:1,
+k4:0},f);b.embossFilterId=f.id;f=Blockly.createSvgElement("pattern",{id:"blocklyDisabledPattern"+e,patternUnits:"userSpaceOnUse",width:10,height:10},d);Blockly.createSvgElement("rect",{width:10,height:10,fill:"#aaa"},f);Blockly.createSvgElement("path",{d:"M 0 0 L 10 10 M 10 0 L 0 10",stroke:"#cc0"},f);b.disabledPatternId=f.id;d=Blockly.createSvgElement("pattern",{id:"blocklyGridPattern"+e,patternUnits:"userSpaceOnUse"},d);0<b.gridOptions.length&&0<b.gridOptions.spacing&&(Blockly.createSvgElement("line",
+{stroke:b.gridOptions.colour},d),1<b.gridOptions.length&&Blockly.createSvgElement("line",{stroke:b.gridOptions.colour},d));b.gridPattern=d;return b.svg=c};
 Blockly.createMainWorkspace_=function(a,b){b.parentWorkspace=null;b.getMetrics=Blockly.getMainWorkspaceMetrics_;b.setMetrics=Blockly.setMainWorkspaceMetrics_;var c=new Blockly.WorkspaceSvg(b);a.appendChild(c.createDom("blocklyMainBackground"));c.markFocused();b.readOnly||b.hasScrollbars||c.addChangeListener(function(){if(0==Blockly.dragMode_){var a=c.getMetrics(),e=a.viewLeft+a.absoluteLeft,f=a.viewTop+a.absoluteTop;if(a.contentTop<f||a.contentTop+a.contentHeight>a.viewHeight+f||a.contentLeft<(b.RTL?
 a.viewLeft:e)||a.contentLeft+a.contentWidth>(b.RTL?a.viewWidth:a.viewWidth+e))for(var g=c.getTopBlocks(!1),h=0,k;k=g[h];h++){var l=k.getRelativeToSurfaceXY(),q=k.getHeightWidth(),m=f+25-q.height-l.y;0<m&&k.moveBy(0,m);m=f+a.viewHeight-25-l.y;0>m&&k.moveBy(0,m);m=25+e-l.x-(b.RTL?0:q.width);0<m&&k.moveBy(m,0);m=e+a.viewWidth-25-l.x+(b.RTL?q.width:0);0>m&&k.moveBy(m,0)}}});Blockly.svgResize(c);Blockly.WidgetDiv.createDom();Blockly.Tooltip.createDom();return c};
 Blockly.init_=function(a){var b=a.options;Blockly.bindEvent_(a.options.svg,"contextmenu",null,function(a){Blockly.isTargetInput_(a)||a.preventDefault()});Blockly.bindEvent_(window,"resize",null,function(){Blockly.svgResize(a)});Blockly.documentEventsBound_||(Blockly.bindEvent_(document,"keydown",null,Blockly.onKeyDown_),Blockly.bindEvent_(document,"touchend",null,Blockly.longStop_),Blockly.bindEvent_(document,"touchcancel",null,Blockly.longStop_),document.addEventListener("mouseup",Blockly.onMouseUp_,
diff --git a/blockly_uncompressed.js b/blockly_uncompressed.js
index d2d931b1..4e1a93e8 100644
--- a/blockly_uncompressed.js
+++ b/blockly_uncompressed.js
@@ -28,7 +28,7 @@ var dir = this.BLOCKLY_DIR.match(/[^\/]+$/)[0];
 goog.addDependency("../../../" + dir + "/core/block.js", ['Blockly.Block'], ['Blockly.Blocks', 'Blockly.Comment', 'Blockly.Connection', 'Blockly.Input', 'Blockly.Mutator', 'Blockly.Warning', 'Blockly.Workspace', 'Blockly.Xml', 'goog.array', 'goog.asserts', 'goog.math.Coordinate', 'goog.string']);
 goog.addDependency("../../../" + dir + "/core/block_svg.js", ['Blockly.BlockSvg'], ['Blockly.Block', 'Blockly.ContextMenu', 'goog.Timer', 'goog.asserts', 'goog.dom', 'goog.math.Coordinate']);
 goog.addDependency("../../../" + dir + "/core/blockly.js", ['Blockly'], ['Blockly.BlockSvg', 'Blockly.FieldAngle', 'Blockly.FieldCheckbox', 'Blockly.FieldColour', 'Blockly.FieldDropdown', 'Blockly.FieldImage', 'Blockly.FieldTextInput', 'Blockly.FieldVariable', 'Blockly.Generator', 'Blockly.Msg', 'Blockly.Procedures', 'Blockly.Toolbox', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.inject', 'Blockly.utils', 'goog.color', 'goog.userAgent']);
-goog.addDependency("../../../" + dir + "/core/blocks.js", ['Blockly.Blocks'], ['goog.asserts']);
+goog.addDependency("../../../" + dir + "/core/blocks.js", ['Blockly.Blocks'], []);
 goog.addDependency("../../../" + dir + "/core/bubble.js", ['Blockly.Bubble'], ['Blockly.Workspace', 'goog.dom', 'goog.math', 'goog.userAgent']);
 goog.addDependency("../../../" + dir + "/core/comment.js", ['Blockly.Comment'], ['Blockly.Bubble', 'Blockly.Icon', 'goog.userAgent']);
 goog.addDependency("../../../" + dir + "/core/connection.js", ['Blockly.Connection', 'Blockly.ConnectionDB'], ['goog.dom']);
diff --git a/core/block_svg.js b/core/block_svg.js
index 192be18d..510d4813 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -1254,7 +1254,8 @@ Blockly.BlockSvg.prototype.updateDisabled = function() {
     if (!hasClass) {
       Blockly.addClass_(/** @type {!Element} */ (this.svgGroup_),
                         'blocklyDisabled');
-      this.svgPath_.setAttribute('fill', 'url(#blocklyDisabledPattern)');
+      this.svgPath_.setAttribute('fill',
+          'url(#' + this.workspace.options.disabledPatternId + ')');
     }
   } else {
     if (hasClass) {
diff --git a/core/blocks.js b/core/blocks.js
index b4f0cb50..d6afbadd 100644
--- a/core/blocks.js
+++ b/core/blocks.js
@@ -23,7 +23,7 @@
  * @author spertus@google.com (Ellen Spertus)
  */
 'use strict';
-goog.require('goog.asserts');
+
 
 /**
  * Name space for the Blocks singleton.
diff --git a/core/bubble.js b/core/bubble.js
index 4f375a07..144ff05a 100644
--- a/core/bubble.js
+++ b/core/bubble.js
@@ -197,7 +197,7 @@ Blockly.Bubble.prototype.autoLayout_ = true;
 Blockly.Bubble.prototype.createDom_ = function(content, hasResize) {
   /* Create the bubble.  Here's the markup that will be generated:
   <g>
-    <g filter="url(#blocklyEmboss)">
+    <g filter="url(#blocklyEmbossFilter837493)">
       <path d="... Z" />
       <rect class="blocklyDraggable" rx="8" ry="8" width="180" height="180"/>
     </g>
@@ -210,7 +210,8 @@ Blockly.Bubble.prototype.createDom_ = function(content, hasResize) {
   </g>
   */
   this.bubbleGroup_ = Blockly.createSvgElement('g', {}, null);
-  var filter = {'filter': 'url(#blocklyEmboss)'};
+  var filter =
+      {'filter': 'url(#' + this.workspace_.options.embossFilterId + ')'};
   if (goog.userAgent.getUserAgentString().indexOf('JavaFX') != -1) {
     // Multiple reports that JavaFX can't handle filters.  UserAgent:
     // Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.44
@@ -568,6 +569,9 @@ Blockly.Bubble.prototype.dispose = function() {
   // Dispose of and unlink the bubble.
   goog.dom.removeNode(this.bubbleGroup_);
   this.bubbleGroup_ = null;
+  this.bubbleArrow_ = null;
+  this.bubbleBack_ = null;
+  this.resizeGroup_ = null;
   this.workspace_ = null;
   this.content_ = null;
   this.shape_ = null;
diff --git a/core/inject.js b/core/inject.js
index 8554d43d..fd18dbd0 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -292,9 +292,9 @@ Blockly.createDom_ = function(container, options) {
   </defs>
   */
   var defs = Blockly.createSvgElement('defs', {}, svg);
-  var filter, feSpecularLighting, feMerge;
+  var rnd = String(Math.random()).substring(2);
   /*
-    <filter id="blocklyEmboss">
+    <filter id="blocklyEmbossFilter837493">
       <feGaussianBlur in="SourceAlpha" stdDeviation="1" result="blur"/>
       <feSpecularLighting in="blur" surfaceScale="1" specularConstant="0.5"
                           specularExponent="10" lighting-color="white"
@@ -307,43 +307,39 @@ Blockly.createDom_ = function(container, options) {
                    k1="0" k2="1" k3="1" k4="0"/>
     </filter>
   */
-  filter = Blockly.createSvgElement('filter', {'id': 'blocklyEmboss'}, defs);
+  var embossFilter = Blockly.createSvgElement('filter',
+      {'id': 'blocklyEmbossFilter' + rnd}, defs);
   Blockly.createSvgElement('feGaussianBlur',
-      {'in': 'SourceAlpha', 'stdDeviation': 1, 'result': 'blur'}, filter);
-  feSpecularLighting = Blockly.createSvgElement('feSpecularLighting',
+      {'in': 'SourceAlpha', 'stdDeviation': 1, 'result': 'blur'}, embossFilter);
+  var feSpecularLighting = Blockly.createSvgElement('feSpecularLighting',
       {'in': 'blur', 'surfaceScale': 1, 'specularConstant': 0.5,
        'specularExponent': 10, 'lighting-color': 'white', 'result': 'specOut'},
-      filter);
+      embossFilter);
   Blockly.createSvgElement('fePointLight',
       {'x': -5000, 'y': -10000, 'z': 20000}, feSpecularLighting);
   Blockly.createSvgElement('feComposite',
       {'in': 'specOut', 'in2': 'SourceAlpha', 'operator': 'in',
-       'result': 'specOut'}, filter);
+       'result': 'specOut'}, embossFilter);
   Blockly.createSvgElement('feComposite',
       {'in': 'SourceGraphic', 'in2': 'specOut', 'operator': 'arithmetic',
-       'k1': 0, 'k2': 1, 'k3': 1, 'k4': 0}, filter);
+       'k1': 0, 'k2': 1, 'k3': 1, 'k4': 0}, embossFilter);
+  options.embossFilterId = embossFilter.id;
   /*
-    <filter id="blocklyShadowFilter">
-      <feGaussianBlur stdDeviation="2"/>
-    </filter>
-  */
-  filter = Blockly.createSvgElement('filter',
-      {'id': 'blocklyShadowFilter'}, defs);
-  Blockly.createSvgElement('feGaussianBlur', {'stdDeviation': 2}, filter);
-  /*
-    <pattern id="blocklyDisabledPattern" patternUnits="userSpaceOnUse"
+    <pattern id="blocklyDisabledPattern837493" patternUnits="userSpaceOnUse"
              width="10" height="10">
       <rect width="10" height="10" fill="#aaa" />
       <path d="M 0 0 L 10 10 M 10 0 L 0 10" stroke="#cc0" />
     </pattern>
   */
   var disabledPattern = Blockly.createSvgElement('pattern',
-      {'id': 'blocklyDisabledPattern', 'patternUnits': 'userSpaceOnUse',
+      {'id': 'blocklyDisabledPattern' + rnd,
+       'patternUnits': 'userSpaceOnUse',
        'width': 10, 'height': 10}, defs);
   Blockly.createSvgElement('rect',
       {'width': 10, 'height': 10, 'fill': '#aaa'}, disabledPattern);
   Blockly.createSvgElement('path',
       {'d': 'M 0 0 L 10 10 M 10 0 L 0 10', 'stroke': '#cc0'}, disabledPattern);
+  options.disabledPatternId = disabledPattern.id;
   /*
     <pattern id="blocklyGridPattern837493" patternUnits="userSpaceOnUse">
       <rect stroke="#888" />
@@ -351,7 +347,7 @@ Blockly.createDom_ = function(container, options) {
     </pattern>
   */
   var gridPattern = Blockly.createSvgElement('pattern',
-      {'id': 'blocklyGridPattern' + String(Math.random()).substring(2),
+      {'id': 'blocklyGridPattern' + rnd,
        'patternUnits': 'userSpaceOnUse'}, defs);
   if (options.gridOptions['length'] > 0 && options.gridOptions['spacing'] > 0) {
     Blockly.createSvgElement('line',
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index e97fde43..5c939fbb 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -148,7 +148,7 @@ Blockly.WorkspaceSvg.prototype.createDom = function(opt_backgroundClass) {
   </g>
   */
   this.svgGroup_ = Blockly.createSvgElement('g',
-    {'class': 'blocklyWorkspace'}, null);
+      {'class': 'blocklyWorkspace'}, null);
   if (opt_backgroundClass) {
     this.svgBackground_ = Blockly.createSvgElement('rect',
         {'height': '100%', 'width': '100%',