Making VisibleSelection operator== take base and extent into account.

Source/core/editing/VisibleSelection.h

Index: Source/core/editing/VisibleSelection.h
diff --git a/Source/core/editing/VisibleSelection.h b/Source/core/editing/VisibleSelection.h
index 1e647e5c0a081ebb3bd9d341ead9d703004d81f3..4b51859d0f292cad40aff746b3786a3e0e8d29be 100644
--- a/Source/core/editing/VisibleSelection.h
+++ b/Source/core/editing/VisibleSelection.h
@@ -181,8 +181,14 @@ private:
 
 inline bool operator==(const VisibleSelection& a, const VisibleSelection& b)
 {
-    return a.start() == b.start() && a.end() == b.end() && a.affinity() == b.affinity() && a.isBaseFirst() == b.isBaseFirst()
-        && a.isDirectional() == b.isDirectional();
+    if (a.affinity() != b.affinity() || a.isDirectional() != b.isDirectional())
+        return false;
+
+    if (a.isNone())
+        return b.isNone();
+
+    return a.start() == b.start() && a.end() == b.end() && a.affinity() == b.affinity()
+        && a.isDirectional() == b.isDirectional() && a.base() == b.base() && a.extent() == b.extent();
 }
 
 inline bool operator!=(const VisibleSelection& a, const VisibleSelection& b)