From 75da6aa055cd71f36060119a39180ee3fda9ff12 Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Thu, 18 May 2023 13:21:26 -0700
Subject: [PATCH] default title to identity if text

---
 src/marks/tip.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/marks/tip.js b/src/marks/tip.js
index 7c583b12d0..2c07fc834b 100644
--- a/src/marks/tip.js
+++ b/src/marks/tip.js
@@ -7,6 +7,7 @@ import {anchorX, anchorY} from "../interactions/pointer.js";
 import {Mark} from "../mark.js";
 import {maybeAnchor, maybeFrameAnchor, maybeTuple, number, string} from "../options.js";
 import {applyDirectStyles, applyFrameAnchor, applyIndirectStyles, applyTransform, impliedString} from "../style.js";
+import {identity, isIterable, isTextual} from "../options.js";
 import {inferTickFormat} from "./axis.js";
 import {applyIndirectTextStyles, defaultWidth, ellipsis, monospaceWidth} from "./text.js";
 import {cut, clipper, splitter, maybeTextOverflow} from "./text.js";
@@ -55,7 +56,7 @@ export class Tip extends Mark {
         x2: {value: x2, scale: "x", optional: x1 == null},
         y2: {value: y2, scale: "y", optional: y1 == null}
       },
-      options,
+      options.title === undefined && isIterable(data) && isTextual(data) ? {...options, title: identity} : options,
       defaults
     );
     this.anchor = maybeAnchor(anchor, "anchor");