From ad9f18c231fa751c750a08f68ba01a345c578abd Mon Sep 17 00:00:00 2001
From: Bram Kragten <mail@bramkragten.nl>
Date: Mon, 16 Aug 2021 05:36:15 +0200
Subject: [PATCH] Keep datasets hidden after data update (#9823)

---
 src/components/chart/ha-chart-base.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/components/chart/ha-chart-base.ts b/src/components/chart/ha-chart-base.ts
index 36970c31a3..035a5dda85 100644
--- a/src/components/chart/ha-chart-base.ts
+++ b/src/components/chart/ha-chart-base.ts
@@ -61,6 +61,11 @@ export default class HaChartBase extends LitElement {
       this.chart.config.type = this.chartType;
     }
     if (changedProps.has("data")) {
+      if (this._hiddenDatasets.size) {
+        this.data.datasets.forEach((dataset, index) => {
+          dataset.hidden = this._hiddenDatasets.has(index);
+        });
+      }
       this.chart.data = this.data;
     }
     if (changedProps.has("options")) {