From 974cd1a41e3d689df722c91f4512779fb9313e5d Mon Sep 17 00:00:00 2001
From: Chris Jordan <jordanchriss@gmail.com>
Date: Mon, 25 Sep 2023 14:18:07 -0400
Subject: [PATCH] fixed annotation list scroll position resetting when
 selecting an annotation

---
 src/neuroglancer/ui/annotations.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/neuroglancer/ui/annotations.ts b/src/neuroglancer/ui/annotations.ts
index 1126ed0f9..8028dcfe1 100644
--- a/src/neuroglancer/ui/annotations.ts
+++ b/src/neuroglancer/ui/annotations.ts
@@ -562,8 +562,12 @@ export class AnnotationLayerView extends Tab {
     }
     const oldLength = this.virtualListSource.length;
     this.updateListLength();
+    // TODO, what problems does this change cause?
+    const insertCount = Math.max(0, listElements.length - oldLength);
+    const deleteCount = Math.max(0, oldLength - listElements.length);
+    const retainCount = Math.min(listElements.length, oldLength);
     this.virtualListSource.changed!.dispatch(
-        [{retainCount: 0, deleteCount: oldLength, insertCount: listElements.length}]);
+        [{retainCount, deleteCount, insertCount}]);
     this.mutableControls.style.display = isMutable ? 'contents' : 'none';
     this.resetOnUpdate();
   }