Bug 1084183 - Propagate text decoration to ruby frames. r=dbaron

layout/generic/nsTextFrame.cpp

@@ -4871,8 +4871,12 @@ nsTextFrame::GetTextDecorations(
 
     // In all modes, if we're on an inline-block or inline-table (or
     // inline-stack, inline-box, inline-grid), we're done.
+    // If we're on a ruby frame other than ruby text container, we
+    // should continue.
     uint8_t display = f->GetDisplay();
     if (display != NS_STYLE_DISPLAY_INLINE &&
+        (!nsStyleDisplay::IsRubyDisplayType(display) ||
+         display == NS_STYLE_DISPLAY_RUBY_TEXT_CONTAINER) &&
         nsStyleDisplay::IsDisplayTypeInlineOutside(display)) {
       break;
     }

layout/style/nsStyleStruct.h

@@ -2137,12 +2137,16 @@ struct nsStyleDisplay {
            NS_STYLE_POSITION_STICKY == mPosition;
   }
 
+  static bool IsRubyDisplayType(uint8_t aDisplay) {
+    return NS_STYLE_DISPLAY_RUBY == aDisplay ||
+           NS_STYLE_DISPLAY_RUBY_BASE == aDisplay ||
+           NS_STYLE_DISPLAY_RUBY_BASE_CONTAINER == aDisplay ||
+           NS_STYLE_DISPLAY_RUBY_TEXT == aDisplay ||
+           NS_STYLE_DISPLAY_RUBY_TEXT_CONTAINER == aDisplay;
+  }
+
   bool IsRubyDisplayType() const {
-    return NS_STYLE_DISPLAY_RUBY == mDisplay ||
-           NS_STYLE_DISPLAY_RUBY_BASE == mDisplay ||
-           NS_STYLE_DISPLAY_RUBY_BASE_CONTAINER == mDisplay ||
-           NS_STYLE_DISPLAY_RUBY_TEXT == mDisplay ||
-           NS_STYLE_DISPLAY_RUBY_TEXT_CONTAINER == mDisplay;
+    return IsRubyDisplayType(mDisplay);
   }
 
   bool IsFlexOrGridDisplayType() const {