Different fonts selected for width calculation and actual painting

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 ffab800073e616f6cedf346a6bab95c8f04066dc..b9405279033bdf57e7e33bc3eff89c951fd89297 100644
--- a/Source/core/rendering/RenderText.cpp
+++ b/Source/core/rendering/RenderText.cpp
@@ -720,23 +720,31 @@ ALWAYS_INLINE float RenderText::widthFromCache(const Font& f, int start, int len
     }
 
     if (f.isFixedPitch() && f.fontDescription().variant() == FontVariantNormal && m_isAllASCII && (!glyphOverflow || !glyphOverflow->computeBounds)) {
+        bool missingGlyph = false;
         float monospaceCharacterWidth = f.spaceWidth();
         float w = 0;
         bool isSpace;
         ASSERT(m_text);
         StringImpl& text = *m_text.impl();
+        RenderStyle * renderStyle = style();
         for (int i = start; i < start + len; i++) {
             char c = text[i];
+            // If glyph is not present in primary font then we cannot calculate width based on primary
+            // font property, we need to call "width" method of Font Object.
+            if (!f.primaryFontHasGlyphForCharacter(text[i])) {
+                missingGlyph = true;
+                break;
+            }
             if (c <= space) {
                 if (c == space || c == newlineCharacter) {
                     w += monospaceCharacterWidth;
                     isSpace = true;
                 } else if (c == characterTabulation) {
-                    if (style()->collapseWhiteSpace()) {
+                    if (renderStyle->collapseWhiteSpace()) {
                         w += monospaceCharacterWidth;
                         isSpace = true;
                     } else {
-                        w += f.tabWidth(style()->tabSize(), xPos + w);
+                        w += f.tabWidth(renderStyle->tabSize(), xPos + w);
                         isSpace = false;
                     }
                 } else
@@ -748,7 +756,8 @@ ALWAYS_INLINE float RenderText::widthFromCache(const Font& f, int start, int len
             if (isSpace && i > start)
                 w += f.fontDescription().wordSpacing();
         }
-        return w;
+        if (!missingGlyph)
+            return w;
     }
 
     TextRun run = constructTextRun(const_cast<RenderText*>(this), f, this, start, len, style(), textDirection);