Fix zero height start or end items being prevented from inflating (#400)

Flipkart · Aug 21, 2019 · f55b989 · f55b989
1 parent d670dc4
commit f55b989
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/core/ViewabilityTracker.ts b/src/core/ViewabilityTracker.ts
@@ -270,10 +270,15 @@ export default class ViewabilityTracker {
         return (window.start >= startBound && window.end <= endBound);
     }
 
+    private _isZeroHeightEdgeElement(window: Range, startBound: number, endBound: number): boolean {
+        return startBound - endBound === 0 && (window.start === startBound || window.end === endBound);
+    }
+
     private _itemIntersectsWindow(window: Range, startBound: number, endBound: number): boolean {
         return this._isItemInBounds(window, startBound) ||
             this._isItemInBounds(window, endBound) ||
-            this._isItemBoundsBeyondWindow(window, startBound, endBound);
+            this._isItemBoundsBeyondWindow(window, startBound, endBound) ||
+            this._isZeroHeightEdgeElement(window, startBound, endBound);
     }
 
     private _itemIntersectsEngagedWindow(startBound: number, endBound: number): boolean {