src/vs/editor/browser/view/viewOverlays.ts/ViewOverlays/prepareRender
class ViewOverlays:	public prepareRender(ctx: RenderingContext): void {
		const toRender = this._dynamicOverlays.filter(overlay => overlay.shouldRender());

		for (let i = 0, len = toRender.length; i < len; i++) {
			const dynamicOverlay = toRender[i];
			dynamicOverlay.prepareRender(ctx);
			dynamicOverlay.onDidRender();
		}
	}