src/vs/workbench/browser/parts/views/viewPaneContainer.ts/ViewPaneContainer/setVisible
class ViewPaneContainer:	setVisible(visible: boolean): void {
		if (this.visible !== !!visible) {
			this.visible = visible;

			this._onDidChangeVisibility.fire(visible);
		}

		this.panes.filter(view => view.isVisible() !== visible)
			.map((view) => view.setVisible(visible));
	}