Add m-esr52 at 52.6.0

1 files changed, 157 insertions, 0 deletions

diff --git a/browser/base/content/test/general/browser_tabopen_reflows.js b/browser/base/content/test/general/browser_tabopen_reflows.js
new file mode 100644
index 000000000..8e04cf12e
--- /dev/null
+++ b/browser/base/content/test/general/browser_tabopen_reflows.js
@@ -0,0 +1,157 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+XPCOMUtils.defineLazyGetter(this, "docShell", () => {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor)
+               .getInterface(Ci.nsIWebNavigation)
+               .QueryInterface(Ci.nsIDocShell);
+});
+
+const EXPECTED_REFLOWS = [
+  // tabbrowser.adjustTabstrip() call after tabopen animation has finished
+  "adjustTabstrip@chrome://browser/content/tabbrowser.xml|" +
+    "_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
+    "onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
+
+  // switching focus in updateCurrentBrowser() causes reflows
+  "_adjustFocusAfterTabSwitch@chrome://browser/content/tabbrowser.xml|" +
+    "updateCurrentBrowser@chrome://browser/content/tabbrowser.xml|" +
+    "onselect@chrome://browser/content/browser.xul|",
+
+  // switching focus in openLinkIn() causes reflows
+  "openLinkIn@chrome://browser/content/utilityOverlay.js|" +
+    "openUILinkIn@chrome://browser/content/utilityOverlay.js|" +
+    "BrowserOpenTab@chrome://browser/content/browser.js|",
+
+  // accessing element.scrollPosition in _fillTrailingGap() flushes layout
+  "get_scrollPosition@chrome://global/content/bindings/scrollbox.xml|" +
+    "_fillTrailingGap@chrome://browser/content/tabbrowser.xml|" +
+    "_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
+    "onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
+
+  // SessionStore.getWindowDimensions()
+  "ssi_getWindowDimension@resource:///modules/sessionstore/SessionStore.jsm|" +
+    "ssi_updateWindowFeatures/<@resource:///modules/sessionstore/SessionStore.jsm|" +
+    "ssi_updateWindowFeatures@resource:///modules/sessionstore/SessionStore.jsm|" +
+    "ssi_collectWindowData@resource:///modules/sessionstore/SessionStore.jsm|",
+
+  // selection change notification may cause querying the focused editor content
+  // by IME and that will cause reflow.
+  "select@chrome://global/content/bindings/textbox.xml|" +
+    "focusAndSelectUrlBar@chrome://browser/content/browser.js|" +
+    "openLinkIn@chrome://browser/content/utilityOverlay.js|" +
+    "openUILinkIn@chrome://browser/content/utilityOverlay.js|" +
+    "BrowserOpenTab@chrome://browser/content/browser.js|",
+
+];
+
+const PREF_PRELOAD = "browser.newtab.preload";
+const PREF_NEWTAB_DIRECTORYSOURCE = "browser.newtabpage.directory.source";
+
+/*
+ * This test ensures that there are no unexpected
+ * uninterruptible reflows when opening new tabs.
+ */
+add_task(function*() {
+  let DirectoryLinksProvider = Cu.import("resource:///modules/DirectoryLinksProvider.jsm", {}).DirectoryLinksProvider;
+  let NewTabUtils = Cu.import("resource://gre/modules/NewTabUtils.jsm", {}).NewTabUtils;
+  let Promise = Cu.import("resource://gre/modules/Promise.jsm", {}).Promise;
+
+  // resolves promise when directory links are downloaded and written to disk
+  function watchLinksChangeOnce() {
+    let deferred = Promise.defer();
+    let observer = {
+      onManyLinksChanged: () => {
+        DirectoryLinksProvider.removeObserver(observer);
+        NewTabUtils.links.populateCache(() => {
+          NewTabUtils.allPages.update();
+          deferred.resolve();
+        }, true);
+      }
+    };
+    observer.onDownloadFail = observer.onManyLinksChanged;
+    DirectoryLinksProvider.addObserver(observer);
+    return deferred.promise;
+  }
+
+  let gOrigDirectorySource = Services.prefs.getCharPref(PREF_NEWTAB_DIRECTORYSOURCE);
+  registerCleanupFunction(() => {
+    Services.prefs.clearUserPref(PREF_PRELOAD);
+    Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, gOrigDirectorySource);
+    return watchLinksChangeOnce();
+  });
+
+  Services.prefs.setBoolPref(PREF_PRELOAD, false);
+  // set directory source to dummy/empty links
+  Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, 'data:application/json,{"test":1}');
+
+  // run tests when directory source change completes
+  yield watchLinksChangeOnce();
+
+  // Perform a click in the top left of content to ensure the mouse isn't
+  // hovering over any of the tiles
+  let target = gBrowser.selectedBrowser;
+  let rect = target.getBoundingClientRect();
+  let left = rect.left + 1;
+  let top = rect.top + 1;
+
+  let utils = window.QueryInterface(Ci.nsIInterfaceRequestor)
+                    .getInterface(Ci.nsIDOMWindowUtils);
+  utils.sendMouseEvent("mousedown", left, top, 0, 1, 0, false, 0, 0);
+  utils.sendMouseEvent("mouseup", left, top, 0, 1, 0, false, 0, 0);
+
+  // Add a reflow observer and open a new tab.
+  docShell.addWeakReflowObserver(observer);
+  BrowserOpenTab();
+
+  // Wait until the tabopen animation has finished.
+  yield waitForTransitionEnd();
+
+  // Remove reflow observer and clean up.
+  docShell.removeWeakReflowObserver(observer);
+  gBrowser.removeCurrentTab();
+});
+
+var observer = {
+  reflow: function (start, end) {
+    // Gather information about the current code path.
+    let path = (new Error().stack).split("\n").slice(1).map(line => {
+      return line.replace(/:\d+:\d+$/, "");
+    }).join("|");
+    let pathWithLineNumbers = (new Error().stack).split("\n").slice(1).join("|");
+
+    // Stack trace is empty. Reflow was triggered by native code.
+    if (path === "") {
+      return;
+    }
+
+    // Check if this is an expected reflow.
+    for (let stack of EXPECTED_REFLOWS) {
+      if (path.startsWith(stack)) {
+        ok(true, "expected uninterruptible reflow '" + stack + "'");
+        return;
+      }
+    }
+
+    ok(false, "unexpected uninterruptible reflow '" + pathWithLineNumbers + "'");
+  },
+
+  reflowInterruptible: function (start, end) {
+    // We're not interested in interruptible reflows.
+  },
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIReflowObserver,
+                                         Ci.nsISupportsWeakReference])
+};
+
+function waitForTransitionEnd() {
+  return new Promise(resolve => {
+    let tab = gBrowser.selectedTab;
+    tab.addEventListener("transitionend", function onEnd(event) {
+      if (event.propertyName === "max-width") {
+        tab.removeEventListener("transitionend", onEnd);
+        resolve();
+      }
+    });
+  });
+}