Fixing bug 266346. Make sure popup state is reset while modal dialogs DOM are open. r+sr=bzbarsky@mit.edu

dom/src/base/nsGlobalWindow.cpp

@@ -2306,6 +2306,10 @@ GlobalWindowImpl::Alert(const nsAString& aString)
   // pending reflows.
   EnsureReflowFlushAndPaint();
 
+  // Reset popup state while opening a window to prevent the current
+  // state from being active the whole time a modal dialog is open.
+  nsAutoPopupStatePusher popupStatePusher(openAbused, PR_TRUE);
+
   return prompter->Alert(title, PromiseFlatString(*str).get());
 }
 
@@ -2335,6 +2339,10 @@ GlobalWindowImpl::Confirm(const nsAString& aString, PRBool* aReturn)
   // pending reflows.
   EnsureReflowFlushAndPaint();
 
+  // Reset popup state while opening a window to prevent the current
+  // state from being active the whole time a modal dialog is open.
+  nsAutoPopupStatePusher popupStatePusher(openAbused, PR_TRUE);
+
   return prompter->Confirm(title, PromiseFlatString(aString).get(), aReturn);
 }
 
@@ -2369,6 +2377,10 @@ GlobalWindowImpl::Prompt(const nsAString& aMessage,
       title.Assign(aTitle);
   }
 
+  // Reset popup state while opening a window to prevent the current
+  // state from being active the whole time a modal dialog is open.
+  nsAutoPopupStatePusher popupStatePusher(openAbused, PR_TRUE);
+
   nsresult rv = prompter->Prompt(title.get(),
                                  PromiseFlatString(aMessage).get(), nsnull,
                                  aSavePassword,