Invalidate the previous caret location when editing text nodes.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 07eebddf33c3a85c0f39b62889e77d5e5184f5b0..f333b192657147cec9c1d807b7e062e3a30bc452 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -3840,6 +3840,12 @@ void Document::nodeWillBeRemoved(Node& n)
     }
 }
 
+void Document::dataWillChange(const CharacterData& characterData)
+{
+    if (LocalFrame* frame = this->frame())
+        frame->selection().dataWillChange(characterData);
+}
+
 void Document::didInsertText(Node* text, unsigned offset, unsigned length)
 {
     for (Range* range : m_ranges)