src/vs/workbench/browser/parts/editor/editorGroupView.ts/EditorGroupView/setActive
class EditorGroupView:	setActive(isActive: boolean): void {
		this.active = isActive;

		// Update container
		this.element.classList.toggle('active', isActive);
		this.element.classList.toggle('inactive', !isActive);

		// Update title control
		this.titleAreaControl.setActive(isActive);

		// Update styles
		this.updateStyles();

		// Event
		this._onDidGroupChange.fire({ kind: GroupChangeKind.GROUP_ACTIVE });
	}