src/vs/workbench/common/editor/textResourceEditorInput.ts/AbstractTextResourceEditorInput/save
class AbstractTextResourceEditorInput:	override save(group: GroupIdentifier, options?: ITextFileSaveOptions): Promise<IUntypedEditorInput | undefined> {

		// If this is neither an `untitled` resource, nor a resource
		// we can handle with the file service, we can only "Save As..."
		if (this.resource.scheme !== Schemas.untitled && !this.fileService.hasProvider(this.resource)) {
			return this.saveAs(group, options);
		}

		// Normal save
		return this.doSave(options, false, group);
	}