src/vs/editor/browser/viewParts/overviewRuler/overviewRuler.ts/OverviewRuler/setLayout
class OverviewRuler:	public setLayout(position: OverviewRulerPosition): void {
		this._domNode.setTop(position.top);
		this._domNode.setRight(position.right);

		let hasChanged = false;
		hasChanged = this._zoneManager.setDOMWidth(position.width) || hasChanged;
		hasChanged = this._zoneManager.setDOMHeight(position.height) || hasChanged;

		if (hasChanged) {
			this._domNode.setWidth(this._zoneManager.getDOMWidth());
			this._domNode.setHeight(this._zoneManager.getDOMHeight());
			this._domNode.domNode.width = this._zoneManager.getCanvasWidth();
			this._domNode.domNode.height = this._zoneManager.getCanvasHeight();

			this._render();
		}
	}