Clean up accessibility tree

src/vs/base/browser/ui/scrollbar/abstractScrollbar.ts

@@ -68,6 +68,8 @@ export abstract class AbstractScrollbar extends Widget {
 		this._mouseMoveMonitor = this._register(new GlobalMouseMoveMonitor<IStandardMouseMoveEventData>());
 		this._shouldRender = true;
 		this.domNode = createFastDomNode(document.createElement('div'));
+		this.domNode.setAttribute('role', 'presentation');
+		this.domNode.setAttribute('aria-hidden', 'true');
 
 		this._visibilityController.setDomNode(this.domNode);
 		this.domNode.setPosition('absolute');

src/vs/editor/browser/viewParts/minimap/minimap.ts

@@ -442,6 +442,8 @@ export class Minimap extends ViewPart {
 		PartFingerprints.write(this._domNode, PartFingerprint.Minimap);
 		this._domNode.setClassName('minimap');
 		this._domNode.setPosition('absolute');
+		this._domNode.setAttribute('role', 'presentation');
+		this._domNode.setAttribute('aria-hidden', 'true');
 		this._domNode.setRight(this._context.configuration.editor.layoutInfo.verticalScrollbarWidth);
 
 		this._shadow = createFastDomNode(document.createElement('div'));

src/vs/editor/browser/viewParts/rulers/rulers.ts

@@ -25,6 +25,8 @@ export class Rulers extends ViewPart {
 	constructor(context: ViewContext) {
 		super(context);
 		this.domNode = createFastDomNode<HTMLElement>(document.createElement('div'));
+		this.domNode.setAttribute('role', 'presentation');
+		this.domNode.setAttribute('aria-hidden', 'true');
 		this.domNode.setClassName('view-rulers');
 		this._renderedRulers = [];
 		this._rulers = this._context.configuration.editor.viewInfo.rulers;

src/vs/editor/browser/viewParts/scrollDecoration/scrollDecoration.ts

@@ -31,6 +31,8 @@ export class ScrollDecorationViewPart extends ViewPart {
 		this._shouldShow = false;
 		this._useShadows = this._context.configuration.editor.viewInfo.scrollbar.useShadows;
 		this._domNode = createFastDomNode(document.createElement('div'));
+		this._domNode.setAttribute('role', 'presentation');
+		this._domNode.setAttribute('aria-hidden', 'true');
 	}
 
 	public dispose(): void {

src/vs/editor/browser/viewParts/viewCursors/viewCursor.ts

@@ -72,8 +72,6 @@ export class ViewCursor {
 		this._domNode.setHeight(this._lineHeight);
 		this._domNode.setTop(0);
 		this._domNode.setLeft(0);
-		this._domNode.setAttribute('role', 'presentation');
-		this._domNode.setAttribute('aria-hidden', 'true');
 		Configuration.applyFontInfo(this._domNode, this._context.configuration.editor.fontInfo);
 		this._domNode.setDisplay('none');
 

src/vs/editor/browser/viewParts/viewCursors/viewCursors.ts

@@ -54,6 +54,8 @@ export class ViewCursors extends ViewPart {
 		this._renderData = [];
 
 		this._domNode = createFastDomNode(document.createElement('div'));
+		this._domNode.setAttribute('role', 'presentation');
+		this._domNode.setAttribute('aria-hidden', 'true');
 		this._updateDomClassName();
 
 		this._domNode.appendChild(this._primaryCursor.getDomNode());