Reland of Make InsertTextCommand not to apply style for empty selection

third_party/WebKit/Source/core/editing/commands/InsertTextCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 258 matching lines @@
     }
   }
 
   SetEndingSelectionWithoutValidation(start_position, end_position);
 
   // Handle the case where there is a typing style.
   if (EditingStyle* typing_style =
           GetDocument().GetFrame()->GetEditor().TypingStyle()) {
     typing_style->PrepareToApplyAt(end_position,
                                    EditingStyle::kPreserveWritingDirection);
-    if (!typing_style->IsEmpty()) {
+    if (!typing_style->IsEmpty() && !EndingSelection().IsNone()) {
       ApplyStyle(typing_style, editing_state);
       if (editing_state->IsAborted())
         return;
     }
   }
 
   if (!select_inserted_text_) {
     SelectionInDOMTree::Builder builder;
     builder.SetAffinity(EndingSelection().Affinity());
     builder.SetIsDirectional(EndingSelection().IsDirectional());
@@ skipping 42 matching lines @@
     }
   }
   if (editing_state->IsAborted())
     return Position();
 
   // return the position following the new tab
   return Position::LastPositionInNode(span_element);
 }
 
 }  // namespace blink