Popup trigger area must filled its parent (fix #15063)

src/display/annotation_layer.js

@@ -418,8 +418,7 @@ class AnnotationElement {
     // If no trigger element is specified, create it.
     if (!trigger) {
       trigger = document.createElement("div");
-      trigger.style.height = container.style.height;
-      trigger.style.width = container.style.width;
+      trigger.className = "popupTriggerArea";
       container.append(trigger);
     }
 

web/annotation_layer_builder.css

@@ -205,6 +205,11 @@
   appearance: none;
 }
 
+.annotationLayer .popupTriggerArea {
+  height: 100%;
+  width: 100%;
+}
+
 .annotationLayer .popupWrapper {
   position: absolute;
   font-size: calc(9px * var(--scale-factor));