Make LayoutText::absoluteQuadsForRange to consider leading/trailing whitespaces

Source/core/rendering/RenderText.cpp

Index: Source/core/rendering/RenderText.cpp
diff --git a/Source/core/rendering/RenderText.cpp b/Source/core/rendering/RenderText.cpp
index 156a2944343ff133c32f58ba96fbf263de87c2ab..d2f81c38893ab783e57f94064166a074bd5e658d 100644
--- a/Source/core/rendering/RenderText.cpp
+++ b/Source/core/rendering/RenderText.cpp
@@ -444,6 +444,13 @@ void RenderText::absoluteQuadsForRange(Vector<FloatQuad>& quads, unsigned start,
     start = std::min(start, static_cast<unsigned>(INT_MAX));
     end = std::min(end, static_cast<unsigned>(INT_MAX));
 
+    const unsigned caretMinOffset = static_cast<unsigned>(this->caretMinOffset());
+    const unsigned caretMaxOffset = static_cast<unsigned>(this->caretMaxOffset());
+
+    // Skip leading and trailing unrendered whitespaces
+    start = std::min(std::max(caretMinOffset, start), caretMaxOffset);
+    end = std::min(std::max(caretMinOffset, end), caretMaxOffset);
+
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         // Note: box->end() returns the index of the last character, not the index past it
         if (start <= box->start() && box->end() < end) {