src/vs/workbench/browser/parts/views/viewPane.ts/ViewPane/getProgressIndicator
class ViewPane:	getProgressIndicator() {
		if (this.progressBar === undefined) {
			// Progress bar
			this.progressBar = this._register(new ProgressBar(this.element));
			this._register(attachProgressBarStyler(this.progressBar, this.themeService));
			this.progressBar.hide();
		}

		if (this.progressIndicator === undefined) {
			this.progressIndicator = this.instantiationService.createInstance(CompositeProgressIndicator, assertIsDefined(this.progressBar), this.id, this.isBodyVisible());
		}
		return this.progressIndicator;
	}