1 files changed, 118 insertions, 0 deletions
diff --git a/dom/plugins/test/mochitest/browser_bug1163570.js b/dom/plugins/test/mochitest/browser_bug1163570.js
new file mode 100644
index 0000000000..6a77728c77
--- /dev/null
+++ b/dom/plugins/test/mochitest/browser_bug1163570.js
@@ -0,0 +1,118 @@
+var gTestRoot = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://127.0.0.1:8888/"
+);
+
+// simple tab load helper, pilfered from browser plugin tests
+function promiseTabLoad(tab, url, eventType = "load") {
+  return new Promise(resolve => {
+    function handle(event) {
+      if (
+        event.originalTarget != tab.linkedBrowser.contentDocument ||
+        event.target.location.href == "about:blank" ||
+        (url && event.target.location.href != url)
+      ) {
+        return;
+      }
+      tab.linkedBrowser.removeEventListener(eventType, handle, true);
+      resolve(event);
+    }
+
+    tab.linkedBrowser.addEventListener(eventType, handle, true, true);
+    if (url) {
+      tab.linkedBrowser.loadURI(url);
+    }
+  });
+}
+
+// dom event listener helper
+function promiseWaitForEvent(
+  object,
+  eventName,
+  capturing = false,
+  chrome = false
+) {
+  return new Promise(resolve => {
+    function listener(event) {
+      object.removeEventListener(eventName, listener, capturing, chrome);
+      resolve(event);
+    }
+    object.addEventListener(eventName, listener, capturing, chrome);
+  });
+}
+
+add_task(async function() {
+  registerCleanupFunction(function() {
+    window.focus();
+  });
+});
+
+add_task(async function() {
+  setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Test Plug-in");
+
+  let pluginTab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser));
+  let prefTab = BrowserTestUtils.addTab(gBrowser);
+
+  await promiseTabLoad(pluginTab, gTestRoot + "plugin_test.html");
+  await promiseTabLoad(prefTab, "about:preferences");
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async function() {
+    let doc = content.document;
+    let plugin = doc.getElementById("testplugin");
+    Assert.ok(!!plugin, "plugin is loaded");
+  });
+
+  let ppromise = promiseWaitForEvent(window, "MozAfterPaint");
+  gBrowser.selectedTab = prefTab;
+  await ppromise;
+
+  // We're going to switch tabs using actual mouse clicks, which helps
+  // reproduce this bug.
+  let tabStripContainer = document.getElementById("tabbrowser-tabs");
+
+  // diagnosis if front end layout changes
+  info("-> " + tabStripContainer.tagName); // tabs
+  info("-> " + tabStripContainer.firstChild.tagName); // tab
+  info("-> " + tabStripContainer.childNodes[0].label); // test harness tab
+  info("-> " + tabStripContainer.childNodes[1].label); // plugin tab
+  info("-> " + tabStripContainer.childNodes[2].label); // preferences tab
+
+  for (let iteration = 0; iteration < 5; iteration++) {
+    ppromise = promiseWaitForEvent(window, "MozAfterPaint");
+    EventUtils.synthesizeMouseAtCenter(
+      tabStripContainer.childNodes[1],
+      {},
+      window
+    );
+    await ppromise;
+
+    await SpecialPowers.spawn(pluginTab.linkedBrowser, [], async function() {
+      let doc = content.document;
+      let plugin = doc.getElementById("testplugin");
+      Assert.ok(
+        XPCNativeWrapper.unwrap(plugin).nativeWidgetIsVisible(),
+        "plugin is visible"
+      );
+    });
+
+    ppromise = promiseWaitForEvent(window, "MozAfterPaint");
+    EventUtils.synthesizeMouseAtCenter(
+      tabStripContainer.childNodes[2],
+      {},
+      window
+    );
+    await ppromise;
+
+    await SpecialPowers.spawn(pluginTab.linkedBrowser, [], async function() {
+      let doc = content.document;
+      let plugin = doc.getElementById("testplugin");
+      Assert.ok(
+        !XPCNativeWrapper.unwrap(plugin).nativeWidgetIsVisible(),
+        "plugin is hidden"
+      );
+    });
+  }
+
+  gBrowser.removeTab(prefTab);
+  gBrowser.removeTab(pluginTab);
+});