Backed out 6 changesets (bug 1439875) for failing mochitest clipboard at browser/components/customizableui/test/browser_editcontrols_update.js and mochitest headless at dom/events/test/pointerevents/test_bug1414336.html on a CLOSED TREE

Backed out changeset f21bdb9b67e8 (bug 1439875)
Backed out changeset bd81fafecd95 (bug 1439875)
Backed out changeset 3296aef96276 (bug 1439875)
Backed out changeset a1237d0711a2 (bug 1439875)
Backed out changeset fc25cbe8e22e (bug 1439875)
Backed out changeset 25e681a47121 (bug 1439875)

browser/base/content/browser.js

@@ -1194,10 +1194,7 @@ function RedirectLoad({ target: browser, data }) {
 }
 
 if (document.documentElement.getAttribute("windowtype") == "navigator:browser") {
-  document.addEventListener("MozBeforeInitialXULLayout", function() {
+  addEventListener("DOMContentLoaded", function() {
-    gBrowserInit.onBeforeInitialXULLayout();
-  }, { once: true });
-  document.addEventListener("DOMContentLoaded", function() {
     gBrowserInit.onDOMContentLoaded();
   }, { once: true });
 }
@@ -1210,27 +1207,6 @@ var delayedStartupPromise = new Promise(resolve => {
 var gBrowserInit = {
   delayedStartupFinished: false,
 
-  onBeforeInitialXULLayout() {
-    // Set a sane starting width/height for all resolutions on new profiles.
-    if (Services.prefs.getBoolPref("privacy.resistFingerprinting")) {
-      // When the fingerprinting resistance is enabled, making sure that we don't
-      // have a maximum window to interfere with generating rounded window dimensions.
-      document.documentElement.setAttribute("sizemode", "normal");
-    } else if (!document.documentElement.hasAttribute("width")) {
-      const TARGET_WIDTH = 1280;
-      const TARGET_HEIGHT = 1040;
-      let width = Math.min(screen.availWidth * .9, TARGET_WIDTH);
-      let height = Math.min(screen.availHeight * .9, TARGET_HEIGHT);
-
-      document.documentElement.setAttribute("width", width);
-      document.documentElement.setAttribute("height", height);
-
-      if (width < TARGET_WIDTH && height < TARGET_HEIGHT) {
-        document.documentElement.setAttribute("sizemode", "maximized");
-      }
-    }
-  },
-
   onDOMContentLoaded() {
     window.QueryInterface(Ci.nsIInterfaceRequestor)
           .getInterface(nsIWebNavigation)
@@ -1270,6 +1246,25 @@ var gBrowserInit = {
       initBrowser.removeAttribute("blank");
     }
 
+    // Set a sane starting width/height for all resolutions on new profiles.
+    if (Services.prefs.getBoolPref("privacy.resistFingerprinting")) {
+      // When the fingerprinting resistance is enabled, making sure that we don't
+      // have a maximum window to interfere with generating rounded window dimensions.
+      document.documentElement.setAttribute("sizemode", "normal");
+    } else if (!document.documentElement.hasAttribute("width")) {
+      const TARGET_WIDTH = 1280;
+      const TARGET_HEIGHT = 1040;
+      let width = Math.min(screen.availWidth * .9, TARGET_WIDTH);
+      let height = Math.min(screen.availHeight * .9, TARGET_HEIGHT);
+
+      document.documentElement.setAttribute("width", width);
+      document.documentElement.setAttribute("height", height);
+
+      if (width < TARGET_WIDTH && height < TARGET_HEIGHT) {
+        document.documentElement.setAttribute("sizemode", "maximized");
+      }
+    }
+
     gBrowser.updateBrowserRemoteness(initBrowser, isRemote, {
       remoteType, sameProcessAsFrameLoader
     });

browser/base/content/test/performance/browser_startup_flicker.js

@@ -22,16 +22,16 @@ add_task(async function() {
     let frame = frames[i], previousFrame = frames[i - 1];
     let rects = compareFrames(frame, previousFrame);
 
-    // The first screenshot we get in OSX / Windows shows an unfocused browser
+    // The first screenshot we get shows an unfocused browser window for some
-    // window for some reason. See bug 1445161.
+    // reason. This is likely due to the test harness, so we want to ignore it.
-    //
     // We'll assume the changes we are seeing are due to this focus change if
     // there are at least 5 areas that changed near the top of the screen, but
     // will only ignore this once (hence the alreadyFocused variable).
     if (!alreadyFocused && rects.length > 5 && rects.every(r => r.y2 < 100)) {
       alreadyFocused = true;
+      // This is likely an issue caused by the test harness, but log it anyway.
       todo(false,
-           "bug 1445161 - the window should be focused at first paint, " + rects.toSource());
+           "the window should be focused at first paint, " + rects.toSource());
       continue;
     }
 

browser/base/content/test/performance/browser_startup_images.js

@@ -61,7 +61,6 @@ const whitelist = [
   {
     file: "chrome://browser/skin/chevron.svg",
     platforms: ["win", "linux", "macosx"],
-    intermittentShown: ["win"],
   },
 
   {

browser/base/content/test/performance/browser_windowopen_flicker.js

@@ -71,25 +71,17 @@ add_task(async function() {
   win.removeEventListener("MozAfterPaint", afterPaintListener);
 
   let unexpectedRects = 0;
-  let alreadyFocused = false;
+  let ignoreTinyPaint = true;
   for (let i = 1; i < frames.length; ++i) {
     let frame = frames[i], previousFrame = frames[i - 1];
-    let rects = compareFrames(frame, previousFrame);
+    if (ignoreTinyPaint &&
-
+        previousFrame.width == 1 && previousFrame.height == 1) {
-    // The first screenshot we get in OSX / Windows shows an unfocused browser
+      todo(false, "shouldn't initially paint a 1x1px window");
-    // window for some reason. See bug 1445161.
-    //
-    // We'll assume the changes we are seeing are due to this focus change if
-    // there are at least 5 areas that changed near the top of the screen, but
-    // will only ignore this once (hence the alreadyFocused variable).
-    if (!alreadyFocused && rects.length > 5 && rects.every(r => r.y2 < 100)) {
-      alreadyFocused = true;
-      todo(false,
-           "bug 1445161 - the window should be focused at first paint, " + rects.toSource());
       continue;
     }
 
-    rects = rects.filter(rect => {
+    ignoreTinyPaint = false;
+    let rects = compareFrames(frame, previousFrame).filter(rect => {
       let inRange = (val, min, max) => min <= val && val <= max;
       let width = frame.width;
 

browser/base/content/test/performance/browser_windowopen_reflows.js

@@ -62,8 +62,12 @@ add_task(async function() {
   let win = OpenBrowserWindow();
 
   await withReflowObserver(async function() {
-    await TestUtils.topicObserved("browser-delayed-startup-finished",
+    let resizeEvent = BrowserTestUtils.waitForEvent(win, "resize");
-                                  subject => subject == win);
+    let delayedStartup =
+      TestUtils.topicObserved("browser-delayed-startup-finished",
+                              subject => subject == win);
+    await resizeEvent;
+    await delayedStartup;
   }, EXPECTED_REFLOWS, win);
 
   await BrowserTestUtils.closeWindow(win);

browser/components/extensions/ext-windows.js

@@ -180,10 +180,14 @@ this.windows = class extends ExtensionAPI {
 
           return new Promise(resolve => {
             window.addEventListener("load", function() {
+              if (["maximized", "normal"].includes(createData.state)) {
+                window.document.documentElement.setAttribute("sizemode", createData.state);
+              }
               resolve(promiseObserved("browser-delayed-startup-finished", win => win == window));
             }, {once: true});
           }).then(() => {
-            if (["minimized", "fullscreen", "docked", "normal", "maximized"].includes(createData.state)) {
+            // Some states only work after delayed-startup-finished
+            if (["minimized", "fullscreen", "docked"].includes(createData.state)) {
               win.state = createData.state;
             }
             if (allowScriptsToClose) {

browser/components/extensions/test/browser/browser_ext_windows_create.js

@@ -103,7 +103,7 @@ add_task(async function testWindowCreate() {
         windowState = latestWindow.STATE_FULLSCREEN;
       }
 
-      if (expected.state == "STATE_NORMAL") {
+      if (expected.state == "STATE_NORMAL" && AppConstants.platform == "macosx") {
         ok(windowState == window.STATE_NORMAL || windowState == window.STATE_MAXIMIZED,
            `Expected windowState (currently ${windowState}) to be STATE_NORMAL but will accept STATE_MAXIMIZED`);
       } else {

dom/xul/XULDocument.cpp

@@ -2662,29 +2662,30 @@ XULDocument::DoneWalking()
 
         NotifyPossibleTitleChange(false);
 
-        nsContentUtils::DispatchTrustedEvent(
-            this,
-            static_cast<nsIDocument*>(this),
-            NS_LITERAL_STRING("MozBeforeInitialXULLayout"),
-            true,
-            false);
-
         // Before starting layout, check whether we're a toplevel chrome
-        // window.  If we are, setup some state so that we don't have to restyle
+        // window.  If we are, set our chrome flags now, so that we don't have
-        // the whole tree after StartLayout.
+        // to restyle the whole frame tree after StartLayout.
-        if (nsCOMPtr<nsIDocShellTreeItem> item = GetDocShell()) {
+        nsCOMPtr<nsIDocShellTreeItem> item = GetDocShell();
+        if (item) {
             nsCOMPtr<nsIDocShellTreeOwner> owner;
             item->GetTreeOwner(getter_AddRefs(owner));
-            if (nsCOMPtr<nsIXULWindow> xulWin = do_GetInterface(owner)) {
+            nsCOMPtr<nsIXULWindow> xulWin = do_GetInterface(owner);
+            if (xulWin) {
                 nsCOMPtr<nsIDocShell> xulWinShell;
                 xulWin->GetDocShell(getter_AddRefs(xulWinShell));
                 if (SameCOMIdentity(xulWinShell, item)) {
-                    // We're the chrome document!
+                    // We're the chrome document!  Apply our chrome flags now.
-                    xulWin->BeforeStartLayout();
+                    xulWin->ApplyChromeFlags();
                 }
             }
         }
 
+        nsContentUtils::DispatchTrustedEvent(this,
+                static_cast<nsIDocument*>(this),
+                NS_LITERAL_STRING("MozBeforeInitialXULLayout"),
+                true,
+                false);
+
         StartLayout();
 
         if (mIsWritingFastLoad && IsChromeURI(mDocumentURI))

xpfe/appshell/nsIXULWindow.idl

@@ -128,14 +128,12 @@ interface nsIXULWindow : nsISupports
   attribute nsIXULBrowserWindow XULBrowserWindow;
 
   /**
-   * Back-door method to make sure some stuff is done when the document is
+   * Back-door method to force application of chrome flags at a particular
-   * ready for layout, that would cause expensive computation otherwise later.
+   * time.  Do NOT call this unless you know what you're doing!  In particular,
-   *
-   * Do NOT call this unless you know what you're doing!  In particular,
    * calling this when this XUL window doesn't yet have a document in its
    * docshell could cause problems.
    */
-  [noscript] void beforeStartLayout();
+  [noscript] void applyChromeFlags();
 
   /**
    * Given the dimensions of some content area held within this

xpfe/appshell/nsXULWindow.cpp

@@ -274,9 +274,8 @@ NS_IMETHODIMP nsXULWindow::SetChromeFlags(uint32_t aChromeFlags)
                "SetChromeFlags() after AssumeChromeFlagsAreFrozen()!");
 
   mChromeFlags = aChromeFlags;
-  if (mChromeLoaded) {
+  if (mChromeLoaded)
-    ApplyChromeFlags();
+    NS_ENSURE_SUCCESS(ApplyChromeFlags(), NS_ERROR_FAILURE);
-  }
   return NS_OK;
 }
 
@@ -1084,7 +1083,82 @@ void nsXULWindow::OnChromeLoaded()
     mChromeLoaded = true;
     ApplyChromeFlags();
     SyncAttributesToWidget();
-    SizeShell();
+
+    int32_t specWidth = -1, specHeight = -1;
+    bool gotSize = false;
+    bool isContent = false;
+
+    GetHasPrimaryContent(&isContent);
+
+    CSSIntSize windowDiff = mWindow
+      ? RoundedToInt(GetWindowOuterInnerDiff(mWindow) /
+                     mWindow->GetDefaultScale())
+      : CSSIntSize();
+
+    // If this window has a primary content and fingerprinting resistance is
+    // enabled, we enforce this window to rounded dimensions.
+    if (isContent && nsContentUtils::ShouldResistFingerprinting()) {
+      ForceRoundedDimensions();
+    } else if (!mIgnoreXULSize) {
+      gotSize = LoadSizeFromXUL(specWidth, specHeight);
+      specWidth += windowDiff.width;
+      specHeight += windowDiff.height;
+    }
+
+    bool positionSet = !mIgnoreXULPosition;
+    nsCOMPtr<nsIXULWindow> parentWindow(do_QueryReferent(mParentWindow));
+#if defined(XP_UNIX) && !defined(XP_MACOSX)
+    // don't override WM placement on unix for independent, top-level windows
+    // (however, we think the benefits of intelligent dependent window placement
+    // trump that override.)
+    if (!parentWindow)
+      positionSet = false;
+#endif
+    if (positionSet) {
+      // We have to do this before sizing the window, because sizing depends
+      // on the resolution of the screen we're on. But positioning needs to
+      // know the size so that it can constrain to screen bounds.... as an
+      // initial guess here, we'll use the specified size (if any).
+      positionSet = LoadPositionFromXUL(specWidth, specHeight);
+    }
+
+    if (gotSize) {
+      SetSpecifiedSize(specWidth, specHeight);
+    }
+
+    if (mIntrinsicallySized) {
+      // (if LoadSizeFromXUL set the size, mIntrinsicallySized will be false)
+      nsCOMPtr<nsIContentViewer> cv;
+      mDocShell->GetContentViewer(getter_AddRefs(cv));
+      if (cv) {
+        nsCOMPtr<nsIDocShellTreeItem> docShellAsItem = do_QueryInterface(mDocShell);
+        nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+        docShellAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
+        if (treeOwner) {
+          // GetContentSize can fail, so initialise |width| and |height| to be
+          // on the safe side.
+          int32_t width = 0, height = 0;
+          if (NS_SUCCEEDED(cv->GetContentSize(&width, &height))) {
+            treeOwner->SizeShellTo(docShellAsItem, width, height);
+            // Update specified size for the final LoadPositionFromXUL call.
+            specWidth = width + windowDiff.width;
+            specHeight = height + windowDiff.height;
+          }
+        }
+      }
+    }
+
+    // Now that we have set the window's final size, we can re-do its
+    // positioning so that it is properly constrained to the screen.
+    if (positionSet) {
+      LoadPositionFromXUL(specWidth, specHeight);
+    }
+
+    LoadMiscPersistentAttributesFromXUL();
+
+    if (mCenterAfterLoad && !positionSet) {
+      Center(parentWindow, parentWindow ? false : true, false);
+    }
 
     if (mShowAfterLoad) {
       SetVisibility(true);
@@ -2188,13 +2262,10 @@ void nsXULWindow::PersistentAttributesDirty(uint32_t aDirtyFlags)
   mPersistentAttributesDirty |= aDirtyFlags & mPersistentAttributesMask;
 }
 
-void
+NS_IMETHODIMP nsXULWindow::ApplyChromeFlags()
-nsXULWindow::ApplyChromeFlags()
 {
   nsCOMPtr<dom::Element> window = GetWindowDOMElement();
-  if (!window) {
+  NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
-    return;
-  }
 
   if (mChromeLoaded) {
     // The two calls in this block don't need to happen early because they
@@ -2233,99 +2304,12 @@ nsXULWindow::ApplyChromeFlags()
 
   // Note that if we're not actually changing the value this will be a no-op,
   // so no need to compare to the old value.
-  IgnoredErrorResult rv;
+  ErrorResult rv;
   window->SetAttribute(NS_LITERAL_STRING("chromehidden"), newvalue, rv);
-}
 
-NS_IMETHODIMP
-nsXULWindow::BeforeStartLayout()
-{
-  ApplyChromeFlags();
-  SyncAttributesToWidget();
-  SizeShell();
   return NS_OK;
 }
 
-void
-nsXULWindow::SizeShell()
-{
-  int32_t specWidth = -1, specHeight = -1;
-  bool gotSize = false;
-  bool isContent = false;
-
-  GetHasPrimaryContent(&isContent);
-
-  CSSIntSize windowDiff = mWindow
-    ? RoundedToInt(GetWindowOuterInnerDiff(mWindow) /
-                   mWindow->GetDefaultScale())
-    : CSSIntSize();
-
-  // If this window has a primary content and fingerprinting resistance is
-  // enabled, we enforce this window to rounded dimensions.
-  if (isContent && nsContentUtils::ShouldResistFingerprinting()) {
-    ForceRoundedDimensions();
-  } else if (!mIgnoreXULSize) {
-    gotSize = LoadSizeFromXUL(specWidth, specHeight);
-    specWidth += windowDiff.width;
-    specHeight += windowDiff.height;
-  }
-
-  bool positionSet = !mIgnoreXULPosition;
-  nsCOMPtr<nsIXULWindow> parentWindow(do_QueryReferent(mParentWindow));
-#if defined(XP_UNIX) && !defined(XP_MACOSX)
-  // don't override WM placement on unix for independent, top-level windows
-  // (however, we think the benefits of intelligent dependent window placement
-  // trump that override.)
-  if (!parentWindow)
-    positionSet = false;
-#endif
-  if (positionSet) {
-    // We have to do this before sizing the window, because sizing depends
-    // on the resolution of the screen we're on. But positioning needs to
-    // know the size so that it can constrain to screen bounds.... as an
-    // initial guess here, we'll use the specified size (if any).
-    positionSet = LoadPositionFromXUL(specWidth, specHeight);
-  }
-
-  if (gotSize) {
-    SetSpecifiedSize(specWidth, specHeight);
-  }
-
-  if (mIntrinsicallySized) {
-    // (if LoadSizeFromXUL set the size, mIntrinsicallySized will be false)
-    nsCOMPtr<nsIContentViewer> cv;
-    mDocShell->GetContentViewer(getter_AddRefs(cv));
-    if (cv) {
-      nsCOMPtr<nsIDocShellTreeItem> docShellAsItem = do_QueryInterface(mDocShell);
-      nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
-      docShellAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
-      if (treeOwner) {
-        // GetContentSize can fail, so initialise |width| and |height| to be
-        // on the safe side.
-        int32_t width = 0, height = 0;
-        if (NS_SUCCEEDED(cv->GetContentSize(&width, &height))) {
-          treeOwner->SizeShellTo(docShellAsItem, width, height);
-          // Update specified size for the final LoadPositionFromXUL call.
-          specWidth = width + windowDiff.width;
-          specHeight = height + windowDiff.height;
-        }
-      }
-    }
-  }
-
-  // Now that we have set the window's final size, we can re-do its
-  // positioning so that it is properly constrained to the screen.
-  if (positionSet) {
-    LoadPositionFromXUL(specWidth, specHeight);
-  }
-
-  LoadMiscPersistentAttributesFromXUL();
-
-  if (mChromeLoaded && mCenterAfterLoad && !positionSet) {
-    Center(parentWindow, parentWindow ? false : true, false);
-  }
-}
-
 NS_IMETHODIMP nsXULWindow::GetXULBrowserWindow(nsIXULBrowserWindow * *aXULBrowserWindow)
 {
   NS_IF_ADDREF(*aXULBrowserWindow = mXULBrowserWindow);

xpfe/appshell/nsXULWindow.h

@@ -93,8 +93,6 @@ protected:
    NS_IMETHOD ForceRoundedDimensions();
    NS_IMETHOD GetAvailScreenSize(int32_t* aAvailWidth, int32_t* aAvailHeight);
 
-   void ApplyChromeFlags();
-   void SizeShell();
    void OnChromeLoaded();
    void StaggerPosition(int32_t &aRequestedX, int32_t &aRequestedY,
                         int32_t aSpecWidth, int32_t aSpecHeight);