Fix tab is invisible when the next stop is close

third_party/WebKit/Source/platform/fonts/Font.h

Index: third_party/WebKit/Source/platform/fonts/Font.h
diff --git a/third_party/WebKit/Source/platform/fonts/Font.h b/third_party/WebKit/Source/platform/fonts/Font.h
index 322c1c5ef4b2ac5dc544a4901875d3c6165d0546..9918b1ee8392d7c9cd8893b09324501dfdf89b14 100644
--- a/third_party/WebKit/Source/platform/fonts/Font.h
+++ b/third_party/WebKit/Source/platform/fonts/Font.h
@@ -194,9 +194,9 @@ inline float Font::tabWidth(const SimpleFontData& fontData, const TabSize& tabSi
         return getFontDescription().letterSpacing();
     float distanceToTabStop = baseTabWidth - fmodf(position, baseTabWidth);
 
-    // The smallest allowable tab space is letterSpacing() (but must be at least one layout unit).
+    // Let the minimum width be the half of the space width so that it's always recognizable.
     // if the distance to the next tab stop is less than that, advance an additional tab stop.
-    if (distanceToTabStop < std::max(getFontDescription().letterSpacing(), LayoutUnit::epsilon()))
+    if (distanceToTabStop < fontData.spaceWidth() / 2)
         distanceToTabStop += baseTabWidth;
 
     return distanceToTabStop;