Bug 732819 - "ASSERTION: don't think me need this any more" with font-size: 0. r=roc.

layout/reftests/svg/reftest.list

@@ -242,6 +242,7 @@ random-if(gtk2Widget) == objectBoundingBox-and-fePointLight-02.svg objectBoundin
 == suspend-07.svg pass.svg
 == suspend-08.svg pass.svg
 == symbol-01.svg symbol-01-ref.svg
+== text-font-size-01.svg pass.svg
 random-if(gtk2Widget) == text-font-weight-01.svg text-font-weight-01-ref.svg # bug 386713
 == text-gradient-01.svg text-gradient-01-ref.svg
 random-if(winWidget) == text-gradient-02.svg text-gradient-02-ref.svg # see bug 590101

layout/reftests/svg/text-font-size-01.svg

@@ -0,0 +1,17 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
+
+  <title>Test text with zero font-size</title>
+
+  <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=732819 -->
+
+  <text x="10" y="50" font-size="0">Some
+    <tspan dy="30">text</tspan>
+    that should not show.
+  </text>
+
+</svg>
+

layout/svg/base/src/nsSVGGlyphFrame.cpp

@@ -304,6 +304,11 @@ nsSVGGlyphFrame::PaintSVG(nsRenderingContext *aContext,
   if (!GetStyleVisibility()->IsVisible())
     return NS_OK;
 
+  if (GetStyleFont()->mFont.size <= 0) {
+    // Don't even try to paint, or cairo will go into an error state.
+    return NS_OK;
+  }
+
   gfxContext *gfx = aContext->ThebesContext();
   PRUint16 renderMode = SVGAutoRenderState::GetRenderMode(aContext);