src/vs/workbench/services/editor/browser/editorService.ts/EditorService/activeTextEditorControl
class EditorService:	get activeTextEditorControl(): ICodeEditor | IDiffEditor | undefined {
		const activeEditorPane = this.activeEditorPane;
		if (activeEditorPane) {
			const activeControl = activeEditorPane.getControl();
			if (isCodeEditor(activeControl) || isDiffEditor(activeControl)) {
				return activeControl;
			}
			if (isCompositeEditor(activeControl) && isCodeEditor(activeControl.activeCodeEditor)) {
				return activeControl.activeCodeEditor;
			}
		}

		return undefined;
	}