Bug 1706750 - Scroll img into view manually if the context menu test is skipped. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D113019

accessible/tests/mochitest/events.js

@@ -1281,6 +1281,27 @@ function synthClick(aNodeOrID, aCheckerOrEventSeq, aArgs) {
   };
 }
 
+/**
+ * Scrolls the node into view.
+ */
+function scrollIntoView(aNodeOrID, aCheckerOrEventSeq) {
+  this.__proto__ = new synthAction(aNodeOrID, aCheckerOrEventSeq);
+
+  this.invoke = function scrollIntoView_invoke() {
+    var targetNode = this.DOMNode;
+    if (isHTMLElement(targetNode)) {
+      targetNode.scrollIntoView(true);
+    } else if (isXULElement(targetNode)) {
+      var targetAcc = getAccessible(targetNode);
+      targetAcc.scrollTo(SCROLL_TYPE_ANYWHERE);
+    }
+  };
+
+  this.getID = function scrollIntoView_getID() {
+    return prettyName(aNodeOrID) + " scrollIntoView";
+  };
+}
+
 /**
  * Mouse move invoker.
  */

accessible/tests/mochitest/events/test_focus_general.html

@@ -105,6 +105,14 @@
         gQueue.push(new synthContextMenu(editableDoc, new contextMenuChecker()));
         gQueue.push(new synthDownKey(editableDoc, new focusContextMenuItemChecker()));
         gQueue.push(new synthEscapeKey(editableDoc, new focusChecker(editableDoc)));
+      } else {
+        // If this test is run as part of multiple tests, it is displayed in the test harness iframe.
+        // In the non-native context menu case, right-clicking the editableDoc causes the editableDoc
+        // to scroll fully into view, and as a side-effect, the img below it ends up on the screen.
+        // When we're skipping the context menu check, scroll img onto the screen manually, because
+        // otherwise it may remain out-of-view and clipped by the test harness iframe.
+        var img = document.querySelector("img");
+        gQueue.push(new scrollIntoView(img, new nofocusChecker(img)));
       }
       if (SEAMONKEY) {
         todo(false, "shift tab from editable document fails on (Windows) SeaMonkey! (Bug 718235)");