Make RenderedRectsForMarkers() to ignore disconnected nodes.

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 4022 matching lines @@
   // it as trailing white space.
   for (; charIt.length(); charIt.advance(1)) {
     UChar c = charIt.characterAt(0);
     if ((!isSpaceOrNewline(c) && c != noBreakSpaceCharacter) || c == '\n')
       return runner;
     runner = charIt.endPosition();
   }
   return runner;
 }
 
+template <typename Strategy>
+void textRects(Vector<IntRect>& rects,
+               const EphemeralRangeTemplate<Strategy>& range) {
+  const PositionTemplate<Strategy> startPosition = range.startPosition();
+  const PositionTemplate<Strategy> endPosition = range.startPosition();
+  Node* startContainer = startPosition.computeContainerNode();
+  DCHECK(startContainer);
+  Node* endContainer = endPosition.computeContainerNode();
+  DCHECK(endContainer);
+
+  for (Node& node : range.nodes()) {
+    LayoutObject* layoutObject = node.layoutObject();
+    if (!layoutObject || !layoutObject->isText())
+      continue;
+    LayoutText* layoutText = toLayoutText(layoutObject);
+    unsigned startOffset =
+        node == startContainer ? startPosition.offsetInContainerNode() : 0;
+    unsigned endOffset = node == endContainer
+                             ? endPosition.offsetInContainerNode()
+                             : std::numeric_limits<unsigned>::max();
+    layoutText->absoluteRectsForRange(rects, startOffset, endOffset);
+  }
+}
+
+IntRect boundingBox(const EphemeralRange& range) {
+  IntRect result;
+  Vector<IntRect> rects;
+  textRects(rects, range);
+  for (const IntRect& rect : rects)
+    result.unite(rect);
+  return result;
+}
+
+IntRect boundingBox(const EphemeralRangeInFlatTree& range) {
+  IntRect result;
+  Vector<IntRect> rects;
+  textRects(rects, range);
+  for (const IntRect& rect : rects)
+    result.unite(rect);
+  return result;
+}
+
 Position skipWhitespace(const Position& position) {
   return skipWhitespaceAlgorithm(position);
 }
 
 PositionInFlatTree skipWhitespace(const PositionInFlatTree& position) {
   return skipWhitespaceAlgorithm(position);
 }
 
 }  // namespace blink