Bug 257581 Cursor (caret) doesn't appear in MailNews Compose Window, although you type something

r=daniel, sr=roc, patch=ginn.chen@sun.com

content/events/src/nsEventStateManager.cpp

@@ -4866,6 +4866,15 @@ nsEventStateManager::ResetBrowseWithCaret()
   if (itemType == nsIDocShellTreeItem::typeChrome)
     return;  // Never browse with caret in chrome
 
+  nsCOMPtr<nsIEditorDocShell> editorDocShell(do_QueryInterface(shellItem));
+  if (editorDocShell) {
+    PRBool isEditable;
+    editorDocShell->GetEditable(&isEditable);
+    if (isEditable) {
+      return;  // Reset caret visibility only if browsing, not editing
+    }
+  }
+
   PRPackedBool browseWithCaret =
     nsContentUtils::GetBoolPref("accessibility.browsewithcaret");