src/vs/workbench/services/editor/browser/editorService.ts/EditorService/visibleTextEditorControls
class EditorService:	get visibleTextEditorControls(): Array<ICodeEditor | IDiffEditor> {
		const visibleTextEditorControls: Array<ICodeEditor | IDiffEditor> = [];
		for (const visibleEditorPane of this.visibleEditorPanes) {
			const control = visibleEditorPane.getControl();
			if (isCodeEditor(control) || isDiffEditor(control)) {
				visibleTextEditorControls.push(control);
			}
		}

		return visibleTextEditorControls;
	}