1 files changed, 14 insertions, 1 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index fef3b8cc5..605877efa 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -13,6 +13,7 @@ import { listSpec } from "./Schema";
 import { ComputedField } from "./ScriptField";
 import { BoolCast, Cast, FieldValue, NumCast, PromiseValue, StrCast, ToConstructor } from "./Types";
 import { deleteProperty, getField, getter, makeEditable, makeReadOnly, setter, updateFunction } from "./util";
+import { intersectRect } from "../Utils";
 
 export namespace Field {
     export function toKeyValueString(doc: Doc, key: string): string {
@@ -343,7 +344,7 @@ export namespace Doc {
         let list = Cast(target[key], listSpec(Doc));
         if (list) {
             if (allowDuplicates !== true) {
-                let pind = list.reduce((l, d, i) => d instanceof Doc && Doc.AreProtosEqual(d, doc) ? i : l, -1);
+                let pind = list.reduce((l, d, i) => d instanceof Doc && d[Id] === doc[Id] ? i : l, -1);
                 if (pind !== -1) {
                     list.splice(pind, 1);
                 }
@@ -614,6 +615,18 @@ export namespace Doc {
         }), 0);
     }
 
+    export function overlapping(doc: Doc, doc2: Doc, clusterDistance: number) {
+        var x2 = NumCast(doc2.x) - clusterDistance;
+        var y2 = NumCast(doc2.y) - clusterDistance;
+        var w2 = NumCast(doc2.width) + clusterDistance;
+        var h2 = NumCast(doc2.height) + clusterDistance;
+        var x = NumCast(doc.x) - clusterDistance;
+        var y = NumCast(doc.y) - clusterDistance;
+        var w = NumCast(doc.width) + clusterDistance;
+        var h = NumCast(doc.height) + clusterDistance;
+        return doc.z === doc2.z && intersectRect({ left: x, top: y, width: w, height: h }, { left: x2, top: y2, width: w2, height: h2 });
+    }
+
     export function isBrushedHighlightedDegree(doc: Doc) {
         if (Doc.IsHighlighted(doc)) {
             return 3;