From 4ddbd46a8426605fd4dd2a55b4f03f96c3dcf3a7 Mon Sep 17 00:00:00 2001
From: santiagodls <santiago.delossantos@meteologica.com>
Date: Thu, 16 Dec 2021 15:24:10 +0100
Subject: [PATCH] fix: unmount on destroy invalidating pending tasks

---
 VirtualList.svelte | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/VirtualList.svelte b/VirtualList.svelte
index c92f65a..fe683ad 100644
--- a/VirtualList.svelte
+++ b/VirtualList.svelte
@@ -1,5 +1,5 @@
 <script>
-	import { onMount, tick } from 'svelte';
+	import { onMount, tick, onDestroy } from 'svelte';
 
 	// props
 	export let items;
@@ -36,6 +36,7 @@
 		const { scrollTop } = viewport;
 
 		await tick(); // wait until the DOM is up to date
+		if (!mounted) return;
 
 		let content_height = top - scrollTop;
 		let i = start;
@@ -46,6 +47,7 @@
 			if (!row) {
 				end = i + 1;
 				await tick(); // render the newly visible row
+				if (!mounted) return;
 				row = rows[i - start];
 			}
 
@@ -132,6 +134,11 @@
 		rows = contents.getElementsByTagName('svelte-virtual-list-row');
 		mounted = true;
 	});
+
+	// mark as unmounted for pending tasks
+	onDestroy(() => {
+		mounted = false;
+	});
 </script>
 
 <style>