Backout b6089a8b78d3 (bug 782547) to see if it fixes Flash hangs.

dom/base/nsGlobalWindow.h

@@ -829,6 +829,8 @@ protected:
 
   bool CanMoveResizeWindows();
 
+  bool     GetBlurSuppression();
+
   // If aDoFlush is true, we'll flush our own layout; otherwise we'll try to
   // just flush our parent and only flush ourselves if we think we need to.
   nsresult GetScrollXY(int32_t* aScrollX, int32_t* aScrollY,

widget/windows/nsFilePicker.cpp

@@ -44,6 +44,27 @@ typedef DWORD FILEOPENDIALOGOPTIONS;
 ///////////////////////////////////////////////////////////////////////////////
 // Helper classes
 
+// Manages matching SuppressBlurEvents calls on the parent widget.
+class AutoSuppressEvents
+{
+public:
+  explicit AutoSuppressEvents(nsIWidget* aWidget) :
+    mWindow(static_cast<nsWindow *>(aWidget)) {
+    SuppressWidgetEvents(true);
+  }
+
+  ~AutoSuppressEvents() {
+    SuppressWidgetEvents(false);
+  }
+private:
+  void SuppressWidgetEvents(bool aFlag) {
+    if (mWindow) {
+      mWindow->SuppressBlurEvents(aFlag);
+    }
+  }
+  nsRefPtr<nsWindow> mWindow;
+};
+
 // Manages the current working path.
 class AutoRestoreWorkingPath
 {
@@ -1006,6 +1027,8 @@ nsFilePicker::ShowW(int16_t *aReturnVal)
 
   *aReturnVal = returnCancel;
 
+  AutoSuppressEvents supress(mParentWidget);
+
   nsAutoString initialDir;
   if (mDisplayDirectory)
     mDisplayDirectory->GetPath(initialDir);

widget/windows/nsWindow.cpp

@@ -164,7 +164,7 @@
 
 #include "nsIContent.h"
 
-#include "mozilla/HangMonitor.h"
+#include "mozilla/HangMonitor.h"
 #include "nsIMM32Handler.h"
 
 using namespace mozilla::widget;
@@ -338,6 +338,7 @@ nsWindow::nsWindow() : nsBaseWidget()
   mOldExStyle           = 0;
   mPainting             = 0;
   mLastKeyboardLayout   = 0;
+  mBlurSuppressLevel    = 0;
   mLastPaintEndTime     = TimeStamp::Now();
 #ifdef MOZ_XUL
   mTransparentSurface   = nullptr;
@@ -4007,14 +4008,25 @@ bool nsWindow::DispatchMouseEvent(uint32_t aEventType, WPARAM wParam,
   return result;
 }
 
-HWND nsWindow::GetTopLevelForFocus(HWND aCurWnd)
+void nsWindow::DispatchFocusToTopLevelWindow(bool aIsActivate)
 {
-  // retrieve the toplevel window or dialog
-  HWND toplevelWnd = NULL;
-  while (aCurWnd) {
-    toplevelWnd = aCurWnd;
+  if (aIsActivate)
+    sJustGotActivate = false;
+  sJustGotDeactivate = false;
 
-    nsWindow *win = WinUtils::GetNSWindowPtr(aCurWnd);
+  if (!aIsActivate && BlurEventsSuppressed())
+    return;
+
+  if (!mWidgetListener)
+    return;
+
+  // retrive the toplevel window or dialog
+  HWND curWnd = mWnd;
+  HWND toplevelWnd = NULL;
+  while (curWnd) {
+    toplevelWnd = curWnd;
+
+    nsWindow *win = WinUtils::GetNSWindowPtr(curWnd);
     if (win) {
       nsWindowType wintype;
       win->GetWindowType(wintype);
@@ -4022,23 +4034,9 @@ HWND nsWindow::GetTopLevelForFocus(HWND aCurWnd)
         break;
     }
 
-    aCurWnd = ::GetParent(aCurWnd); // Parent or owner (if has no parent)
+    curWnd = ::GetParent(curWnd); // Parent or owner (if has no parent)
   }
 
-  return toplevelWnd;
-}
-
-void nsWindow::DispatchFocusToTopLevelWindow(bool aIsActivate)
-{
-  if (aIsActivate)
-    sJustGotActivate = false;
-  sJustGotDeactivate = false;
-  mLastKillFocusWindow = NULL;
-
-  if (!mWidgetListener)
-    return;
-
-  HWND toplevelWnd = GetTopLevelForFocus(mWnd);
   if (toplevelWnd) {
     nsWindow *win = WinUtils::GetNSWindowPtr(toplevelWnd);
     if (win) {
@@ -4068,6 +4066,36 @@ bool nsWindow::IsTopLevelMouseExit(HWND aWnd)
   return WinUtils::GetTopLevelHWND(aWnd) != mouseTopLevel;
 }
 
+bool nsWindow::BlurEventsSuppressed()
+{
+  // are they suppressed in this window?
+  if (mBlurSuppressLevel > 0)
+    return true;
+
+  // are they suppressed by any container widget?
+  HWND parentWnd = ::GetParent(mWnd);
+  if (parentWnd) {
+    nsWindow *parent = WinUtils::GetNSWindowPtr(parentWnd);
+    if (parent)
+      return parent->BlurEventsSuppressed();
+  }
+  return false;
+}
+
+// In some circumstances (opening dependent windows) it makes more sense
+// (and fixes a crash bug) to not blur the parent window. Called from
+// nsFilePicker.
+void nsWindow::SuppressBlurEvents(bool aSuppress)
+{
+  if (aSuppress)
+    ++mBlurSuppressLevel; // for this widget
+  else {
+    NS_ASSERTION(mBlurSuppressLevel > 0, "unbalanced blur event suppression");
+    if (mBlurSuppressLevel > 0)
+      --mBlurSuppressLevel;
+  }
+}
+
 bool nsWindow::ConvertStatus(nsEventStatus aStatus)
 {
   return aStatus == nsEventStatus_eConsumeNoDefault;
@@ -4998,13 +5026,9 @@ bool nsWindow::ProcessMessage(UINT msg, WPARAM &wParam, LPARAM &lParam,
         int32_t fActive = LOWORD(wParam);
 
         if (WA_INACTIVE == fActive) {
-          // When minimizing a window, the deactivation and focus events will
+          // when minimizing a window, the deactivation and focus events will
           // be fired in the reverse order. Instead, just deactivate right away.
-          // This can also happen when a modal file dialog is opened, so check
-          // if the last window to receive the WM_KILLFOCUS message was this one
-          // or a child of this one.
-          if (HIWORD(wParam) ||
-              (mLastKillFocusWindow && (GetTopLevelForFocus(mLastKillFocusWindow) == mWnd)))
+          if (HIWORD(wParam))
             DispatchFocusToTopLevelWindow(false);
           else
             sJustGotDeactivate = true;
@@ -5080,9 +5104,6 @@ bool nsWindow::ProcessMessage(UINT msg, WPARAM &wParam, LPARAM &lParam,
       if (sJustGotDeactivate) {
         DispatchFocusToTopLevelWindow(false);
       }
-      else {
-        mLastKillFocusWindow = mWnd;
-      }
       break;
 
     case WM_WINDOWPOSCHANGED:
@@ -7056,9 +7077,6 @@ void nsWindow::OnDestroy()
   mWidgetListener = nullptr;
   mAttachedWidgetListener = nullptr;
 
-  if (mWnd == mLastKillFocusWindow)
-    mLastKillFocusWindow = NULL;
-
   // Free our subclass and clear |this| stored in the window props. We will no longer
   // receive events from Windows after this point.
   SubclassWindow(FALSE);
@@ -7073,7 +7091,7 @@ void nsWindow::OnDestroy()
 
   // Release references to children, device context, toolkit, and app shell.
   nsBaseWidget::OnDestroy();
-
+  
   // Clear our native parent handle.
   // XXX Windows will take care of this in the proper order, and SetParent(nullptr)'s
   // remove child on the parent already took place in nsBaseWidget's Destroy call above.

widget/windows/nsWindow.h

@@ -203,6 +203,8 @@ public:
                                               LPARAM aLParam,
                                               bool aDispatchPendingEvents);
 
+  void                    SuppressBlurEvents(bool aSuppress); // Called from nsFilePicker
+  bool                    BlurEventsSuppressed();
 #ifdef ACCESSIBILITY
   Accessible* GetRootAccessible();
 #endif // ACCESSIBILITY
@@ -327,7 +329,6 @@ protected:
    * Event processing helpers
    */
   bool                    DispatchPluginEvent(const MSG &aMsg);
-  HWND                    GetTopLevelForFocus(HWND aCurWnd);
   void                    DispatchFocusToTopLevelWindow(bool aIsActivate);
   bool                    DispatchStandardEvent(uint32_t aMsg);
   bool                    DispatchCommandEvent(uint32_t aEventCommand);
@@ -469,6 +470,7 @@ protected:
   bool                  mFullscreenMode;
   bool                  mMousePresent;
   bool                  mDestroyCalled;
+  uint32_t              mBlurSuppressLevel;
   DWORD_PTR             mOldStyle;
   DWORD_PTR             mOldExStyle;
   InputContext mInputContext;
@@ -481,7 +483,6 @@ protected:
   uint32_t              mPickerDisplayCount;
   HICON                 mIconSmall;
   HICON                 mIconBig;
-  HWND                  mLastKillFocusWindow;
   static bool           sDropShadowEnabled;
   static uint32_t       sInstanceCount;
   static TriStateBool   sCanQuit;