Fix the first expectation of `pointerevent_after_target_removed.html?…

…mouse` to conform to the spec

`pointerup` should not imply the pointer move and `pointerover` should be fired
only when the pointer is actually moved. Therefore, `pointerover` should be
fired after `pointerup` which is followed by another `pointermove` instead of
before `pointerup`.

Differential Revision: https://phabricator.services.mozilla.com/D199607

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1823658
gecko-commit: 6cfd68d8e76b8a3b82fb7224ca48e1ddff388e3b
gecko-reviewers: smaug

pointerevents/pointerevent_after_target_removed.html

@@ -104,12 +104,24 @@
   setup();
 
   // Tests for dispatched pointer events.
-  addPromiseTest("pointerdown", "pointer", [
-    "pointerover@child", "pointerenter@parent", "pointerenter@child",
-    "pointerdown@child", "(child-removed)", "pointerover@parent", "pointerup@parent",
-    "pointerdown@parent", "pointerup@parent",
-    "pointerout@parent", "pointerleave@parent"
-  ]);
+  addPromiseTest("pointerdown", "pointer",
+    pointer_type == "mouse"
+      // `pointerup` after removing the child should not cause `pointerover`
+      // on the parent if the pointer type is hoverable because pointer boundary
+      // events should be fired only when the hoverable pointer is actually
+      // moved.
+      ? [
+        "pointerover@child", "pointerenter@parent", "pointerenter@child",
+        "pointerdown@child", "(child-removed)", "pointerup@parent",
+        "pointerover@parent", "pointerdown@parent", "pointerup@parent",
+        "pointerout@parent", "pointerleave@parent"
+      ]
+      : [
+        "pointerover@child", "pointerenter@parent", "pointerenter@child",
+        "pointerdown@child", "(child-removed)", "pointerover@parent", "pointerup@parent",
+        "pointerdown@parent", "pointerup@parent",
+        "pointerout@parent", "pointerleave@parent"
+      ]);
   addPromiseTest("pointerup", "pointer", [
     "pointerover@child", "pointerenter@parent", "pointerenter@child",
     "pointerdown@child", "pointerup@child", "(child-removed)",