Avoid style clobbering in setCompositionFromExistingText. (2nd land)

Source/web/tests/WebViewTest.cpp

Index: Source/web/tests/WebViewTest.cpp
diff --git a/Source/web/tests/WebViewTest.cpp b/Source/web/tests/WebViewTest.cpp
index ea64a12c23f7a46f91be07b99d073bc78023291c..c5195b43a810ea5b3368f6037a2a913e02dea6f5 100644
--- a/Source/web/tests/WebViewTest.cpp
+++ b/Source/web/tests/WebViewTest.cpp
@@ -1044,6 +1044,21 @@ TEST_F(WebViewTest, SetCompositionFromExistingTextInTextArea)
     EXPECT_EQ(-1, info.compositionEnd);
 }
 
+TEST_F(WebViewTest, SetCompositionFromExistingTextInRichText)
+{
+    URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(m_baseURL.c_str()), WebString::fromUTF8("content_editable_rich_text.html"));
+    WebView* webView = m_webViewHelper.initializeAndLoad(m_baseURL + "content_editable_rich_text.html");
+    webView->setInitialFocus(false);
+    WebVector<WebCompositionUnderline> underlines(static_cast<size_t>(1));
+    underlines[0] = WebCompositionUnderline(0, 4, 0, false, 0);
+    WebLocalFrameImpl* frame = toWebLocalFrameImpl(webView->mainFrame());
+    frame->setEditableSelectionOffsets(1, 1);
+    WebDocument document = webView->mainFrame()->document();
+    EXPECT_FALSE(document.getElementById("bold").isNull());
+    frame->setCompositionFromExistingText(0, 4, underlines);
+    EXPECT_FALSE(document.getElementById("bold").isNull());
+}
+
 TEST_F(WebViewTest, SetEditableSelectionOffsetsKeepsComposition)
 {
     URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(m_baseURL.c_str()), WebString::fromUTF8("input_field_populated.html"));