Ensure valid VisiblePosition input for character{Before,After}

third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 752 matching lines @@
 
     if (textNode->length() == 0)
         return;
     LayoutText* layoutText = textNode->layoutObject();
     if (layoutText && !layoutText->style()->collapseWhiteSpace())
         return;
 
     // Delete collapsed whitespace so that inserting nbsps doesn't uncollapse it.
     Position upstreamPos = mostBackwardCaretPosition(position);
     deleteInsignificantText(upstreamPos, mostForwardCaretPosition(position));
+
+    document().updateStyleAndLayoutIgnorePendingStylesheets();
     position = mostForwardCaretPosition(upstreamPos);
-
-    VisiblePosition visiblePos = createVisiblePositionDeprecated(position);
+    VisiblePosition visiblePos = createVisiblePosition(position);
     VisiblePosition previousVisiblePos = previousPositionOf(visiblePos);
     replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(previousVisiblePos);
-    replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(visiblePos);
+
+    document().updateStyleAndLayoutIgnorePendingStylesheets();
+    replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(createVisiblePosition(position));
 }
 
 void CompositeEditCommand::replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(const VisiblePosition& visiblePosition)
 {
     if (!isCollapsibleWhitespace(characterAfter(visiblePosition)))
         return;
     Position pos = mostForwardCaretPosition(visiblePosition.deepEquivalent());
     if (!pos.computeContainerNode() || !pos.computeContainerNode()->isTextNode())
         return;
     replaceTextInNodePreservingMarkers(toText(pos.computeContainerNode()), pos.offsetInContainerNode(), 1, nonBreakingSpaceString());
@@ skipping 868 matching lines @@
 }
 
 DEFINE_TRACE(CompositeEditCommand)
 {
     visitor->trace(m_commands);
     visitor->trace(m_composition);
     EditCommand::trace(visitor);
 }
 
 } // namespace blink