src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/setInput
class SideBySideEditor:	override async setInput(input: SideBySideEditorInput, options: IEditorOptions | undefined, context: IEditorOpenContext, token: CancellationToken): Promise<void> {
		const oldInput = this.input;
		await super.setInput(input, options, context, token);

		return this.updateInput(oldInput, input, options, context, token);
	}