From fb42da7de606ec03b8d58773479374492f6e93be Mon Sep 17 00:00:00 2001
From: dangotbanned <125183946+dangotbanned@users.noreply.github.com>
Date: Wed, 18 Sep 2024 11:29:53 +0100
Subject: [PATCH] fix: Use `selector` argument in `make_example`

All of the charts using this function were silently producing no output.
`brush` had been defined globally in an earlier directive

https://github.com/vega/altair/pull/3544#discussion_r1764228089
---
 doc/user_guide/interactions/parameters.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/user_guide/interactions/parameters.rst b/doc/user_guide/interactions/parameters.rst
index a569fb0c5..eeaf8d0f8 100644
--- a/doc/user_guide/interactions/parameters.rst
+++ b/doc/user_guide/interactions/parameters.rst
@@ -318,7 +318,7 @@ selection:
         return alt.Chart(cars).mark_rect().encode(
             x="Cylinders:O",
             y="Origin:N",
-            color=alt.when(brush).then("count()").otherwise(alt.value("lightgray")),
+            color=alt.when(selector).then("count()").otherwise(alt.value("lightgray")),
         ).properties(
             width=300,
             height=180