changeset:   312055:b74f1ab939d2
  user:        Olli Pettay <Olli.Pettay@helsinki.fi>
  Date:        Mon May 16 21:42:24 2016 +0300
  summary:     Bug 1273202, make sure to not keep objects alive too long because of some useless event dispatching, r=jwatt a=ritu

diff -r 072992bf176d -r b74f1ab939d2 dom/html/HTMLInputElement.cpp
--- a/dom/html/HTMLInputElement.cpp	Sun May 15 17:03:06 2016 +0300
+++ b/dom/html/HTMLInputElement.cpp	Mon May 16 21:42:24 2016 +0300
@@ -1168,7 +1168,7 @@
     mFileList->Disconnect();
   }
   if (mNumberControlSpinnerIsSpinning) {
-    StopNumberControlSpinnerSpin();
+    StopNumberControlSpinnerSpin(eDisallowDispatchingEvents);
   }
   DestroyImageLoadingContent();
   FreeData();
@@ -3721,7 +3721,7 @@
 }
 
 void
-HTMLInputElement::StopNumberControlSpinnerSpin()
+HTMLInputElement::StopNumberControlSpinnerSpin(SpinnerStopState aState)
 {
   if (mNumberControlSpinnerIsSpinning) {
     if (nsIPresShell::GetCapturingContent() == this) {
@@ -3732,11 +3732,16 @@
 
     mNumberControlSpinnerIsSpinning = false;
 
-    FireChangeEventIfNeeded();
+    if (aState == eAllowDispatchingEvents) {
+      FireChangeEventIfNeeded();
+    }
 
     nsNumberControlFrame* numberControlFrame =
       do_QueryFrame(GetPrimaryFrame());
     if (numberControlFrame) {
+      MOZ_ASSERT(aState == eAllowDispatchingEvents,
+                 "Shouldn't have primary frame for the element when we're not "
+                 "allowed to dispatch events to it anymore.");
       numberControlFrame->SpinnerStateChanged();
     }
   }
diff -r 072992bf176d -r b74f1ab939d2 dom/html/HTMLInputElement.h
--- a/dom/html/HTMLInputElement.h	Sun May 15 17:03:06 2016 +0300
+++ b/dom/html/HTMLInputElement.h	Mon May 16 21:42:24 2016 +0300
@@ -721,7 +721,12 @@
   HTMLInputElement* GetOwnerNumberControl();
 
   void StartNumberControlSpinnerSpin();
-  void StopNumberControlSpinnerSpin();
+  enum SpinnerStopState {
+    eAllowDispatchingEvents,
+    eDisallowDispatchingEvents
+  };
+  void StopNumberControlSpinnerSpin(SpinnerStopState aState =
+                                      eAllowDispatchingEvents);
   void StepNumberControlForUserEvent(int32_t aDirection);
 
   /**