Speed up moving cursor/selection up or down past non-renderered elements.

Source/core/editing/VisibleUnits.cpp

Index: Source/core/editing/VisibleUnits.cpp
diff --git a/Source/core/editing/VisibleUnits.cpp b/Source/core/editing/VisibleUnits.cpp
index 141fae1f2592a2291037fe38e5fb8c486255591a..025745fdb34889cbe189eb192189ec8591e9e027 100644
--- a/Source/core/editing/VisibleUnits.cpp
+++ b/Source/core/editing/VisibleUnits.cpp
@@ -79,7 +79,7 @@ static Position previousRootInlineBoxCandidatePosition(Node* node, const Visible
     Node* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent(), editableType);
     Node* previousNode = previousLeafWithSameEditability(node, editableType);
 
-    while (previousNode && inSameLine(firstPositionInOrBeforeNode(previousNode), visiblePosition))
+    while (previousNode && (!previousNode->renderer() || inSameLine(firstPositionInOrBeforeNode(previousNode), visiblePosition)))
         previousNode = previousLeafWithSameEditability(previousNode, editableType);
 
     while (previousNode && !previousNode->isShadowRoot()) {
@@ -101,7 +101,7 @@ static Position nextRootInlineBoxCandidatePosition(Node* node, const VisiblePosi
 {
     Node* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent(), editableType);
     Node* nextNode = nextLeafWithSameEditability(node, editableType);
-    while (nextNode && inSameLine(firstPositionInOrBeforeNode(nextNode), visiblePosition))
+    while (nextNode && (!nextNode->renderer() || inSameLine(firstPositionInOrBeforeNode(nextNode), visiblePosition)))
         nextNode = nextLeafWithSameEditability(nextNode, ContentIsEditable);
 
     while (nextNode && !nextNode->isShadowRoot()) {