Force glyph overflow calculation

Source/core/layout/line/BreakingContextInlineHeaders.h

Index: Source/core/layout/line/BreakingContextInlineHeaders.h
diff --git a/Source/core/layout/line/BreakingContextInlineHeaders.h b/Source/core/layout/line/BreakingContextInlineHeaders.h
index 7127ed536fed6d72317e486ad18a462668589db4..872c379a4897da50c82a8be1341df502e048a916 100644
--- a/Source/core/layout/line/BreakingContextInlineHeaders.h
+++ b/Source/core/layout/line/BreakingContextInlineHeaders.h
@@ -511,15 +511,18 @@ ALWAYS_INLINE TextDirection textDirectionFromUnicode(WTF::Unicode::Direction dir
 
 ALWAYS_INLINE float textWidth(LayoutText* text, unsigned from, unsigned len, const Font& font, float xPos, bool collapseWhiteSpace, HashSet<const SimpleFontData*>* fallbackFonts = nullptr)
 {
-    GlyphOverflow glyphOverflow;
-    if ((!from && len == text->textLength()) || text->style()->hasTextCombine())
-        return text->width(from, len, font, xPos, text->style()->direction(), fallbackFonts, &glyphOverflow);
+    if ((!from && len == text->textLength()) || text->style()->hasTextCombine()) {
+        GlyphOverflow glyphOverflow;
+        return text->width(from, len, font, xPos, text->style()->direction(), fallbackFonts,
+            // LayoutText caches fallbackFonts and glyphOverflow together, and requires them to be both null or both non-null.
+            fallbackFonts ? &glyphOverflow : nullptr);
+    }
 
     TextRun run = constructTextRun(text, font, text, from, len, text->styleRef());
     run.setCodePath(text->canUseSimpleFontCodePath() ? TextRun::ForceSimple : TextRun::ForceComplex);
     run.setTabSize(!collapseWhiteSpace, text->style()->tabSize());
     run.setXPos(xPos);
-    return font.width(run, fallbackFonts, &glyphOverflow);
+    return font.width(run, fallbackFonts, nullptr);
 }
 
 inline bool BreakingContext::handleText(WordMeasurements& wordMeasurements, bool& hyphenated)