[Editing] Let InputMethodController::hasComposition check Range::isConnected().

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

Index: third_party/WebKit/Source/core/editing/InputMethodController.cpp
diff --git a/third_party/WebKit/Source/core/editing/InputMethodController.cpp b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
index fa406b5295850c63a436280e4e7d1fe9ee70786c..465fc735662f7250e044354ec2211c1af5cf49e4 100644
--- a/third_party/WebKit/Source/core/editing/InputMethodController.cpp
+++ b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
@@ -182,7 +182,8 @@ Document& InputMethodController::document() const {
 }
 
 bool InputMethodController::hasComposition() const {
-  return m_hasComposition;
+  return m_hasComposition && !m_compositionRange->collapsed() &&
+         m_compositionRange->isConnected();
 }
 
 inline Editor& InputMethodController::editor() const {
@@ -314,6 +315,7 @@ bool InputMethodController::replaceCompositionAndMoveCaret(
   Element* rootEditableElement = frame().selection().rootEditableElement();
   if (!rootEditableElement)
     return false;
+  DCHECK(hasComposition());
   PlainTextRange compositionRange =
       PlainTextRange::create(*rootEditableElement, *m_compositionRange);
   if (compositionRange.isNull())