[WIP, not for review] Workaround for setComposition styling clobber

third_party/WebKit/Source/core/editing/InputMethodControllerTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/editing/InputMethodController.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/Range.h"
 #include "core/editing/FrameSelection.h"
 #include "core/events/MouseEvent.h"
@@ skipping 89 matching lines @@
     underlines.append(CompositionUnderline(0, 5, Color(255, 0, 0), false, 0));
     controller().setCompositionFromExistingText(underlines, 0, 5);
 
     Range* range = controller().compositionRange();
     EXPECT_EQ(0, range->startOffset());
     EXPECT_EQ(5, range->endOffset());
 
     PlainTextRange plainTextRange(PlainTextRange::create(*div, *range));
     EXPECT_EQ(0u, plainTextRange.start());
     EXPECT_EQ(5u, plainTextRange.end());
+
+    controller().setComposition(String("hellobar"), underlines, 8, 8);
+    range = controller().compositionRange();
+    EXPECT_EQ(0, range->startOffset());
+    EXPECT_EQ(8, range->endOffset());
+
+    controller().confirmComposition();
 }
 
 TEST_F(InputMethodControllerTest, SelectionOnConfirmExistingText)
 {
     insertHTMLElement(
         "<div id='sample' contenteditable='true'>hello world</div>", "sample");
 
     Vector<CompositionUnderline> underlines;
     underlines.append(CompositionUnderline(0, 5, Color(255, 0, 0), false, 0));
     controller().setCompositionFromExistingText(underlines, 0, 5);
@@ skipping 250 matching lines @@
     controller().setComposition("foo", underlines, 0, 3);
     EXPECT_STREQ("beforeinput.isComposing:true", document().title().utf8().data());
 
     document().setTitle(emptyString());
     controller().confirmComposition();
     // Last 'beforeinput' should also be inside composition scope.
     EXPECT_STREQ("beforeinput.isComposing:true", document().title().utf8().data());
 }
 
 } // namespace blink