src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/setEditorVisible
class SideBySideEditor:	protected override setEditorVisible(visible: boolean, group: IEditorGroup | undefined): void {

		// Forward to both sides
		this.primaryEditorPane?.setVisible(visible, group);
		this.secondaryEditorPane?.setVisible(visible, group);

		super.setEditorVisible(visible, group);
	}