Bug 655877 - Part 18: Ensure even line-ending white space SVG text frames are created. r=bz

layout/base/nsCSSFrameConstructor.cpp

@@ -5509,12 +5509,14 @@ nsCSSFrameConstructor::ConstructFramesFromItem(nsFrameConstructorState& aState,
     // We don't do it for content that may have XBL anonymous siblings,
     // because they make it difficult to correctly create the frame
     // due to dynamic changes.
-    // We don't do it for text that's not a line participant (i.e. SVG text).
+    // We don't do it for SVG text, since we might need to position and
+    // measure the white space glyphs due to x/y/dx/dy attributes.
     if (AtLineBoundary(aIter) &&
         !styleContext->GetStyleText()->NewlineIsSignificant() &&
         aIter.List()->ParentHasNoXBLChildren() &&
         !(aState.mAdditionalStateBits & NS_FRAME_GENERATED_CONTENT) &&
         (item.mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) &&
+        !(item.mFCData->mBits & FCDATA_IS_SVG_TEXT) &&
         item.IsWhitespace(aState))
       return NS_OK;