handle series of (de)select events together

website/src/lib/components/file-list/FileListNodeContent.svelte

@@ -48,8 +48,15 @@
 	let sortable: Sortable;
 	let orientation = getContext<'vertical' | 'horizontal'>('orientation');
 
+	let lastUpdateStart = 0;
 	function updateToSelection(e) {
-		if (updating) return;
+		lastUpdateStart = Date.now();
+		setTimeout(() => {
+			if (Date.now() - lastUpdateStart >= 40) {
+				if (updating) {
+					return;
+				}
+
 				updating = true;
 				// Sortable updates selection
 				let changed = getChangedIds();
@@ -78,6 +85,8 @@
 				}
 				updating = false;
 			}
+		}, 50);
+	}
 
 	function updateFromSelection() {
 		if (updating) return;