src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/disposeEditors
class SideBySideEditor:	private disposeEditors(): void {
		this.editorDisposables.clear();

		this.secondaryEditorPane = undefined;
		this.primaryEditorPane = undefined;

		this.lastFocusedSide = undefined;

		if (this.secondaryEditorContainer) {
			clearNode(this.secondaryEditorContainer);
		}

		if (this.primaryEditorContainer) {
			clearNode(this.primaryEditorContainer);
		}
	}