Bug 417178 - "Google reader does not show subscribed topics in ff3b3 at certain zoom levels" [p=roc@ocallahan.org (Robert O'Callahan [roc]) r+sr=dbaron a1.9b5=mconnor]

layout/reftests/bugs/reftest.list

@@ -756,6 +756,7 @@ fails == 413027-3.html 413027-3-ref.html
 == 414851-1.html 414851-1-ref.html
 == 416106-1.xhtml 416106-1-ref.xhtml
 == 416752-1.html 416752-1-ref.html
+== 417178-1.html 417178-1-ref.html
 == 417246-1.html 417246-1-ref.html
 == 417676.html 417676-ref.html
 == 418766-1a.html 418766-1-ref.html

layout/style/nsStyleStruct.h

@@ -306,10 +306,11 @@ struct nsBorderColors {
   }
 };
 
-// Border widths are rounded to the nearest integer number of pixels, but values
-// between zero and one device pixels are always rounded up to one device pixel.
+// Border widths are rounded to the nearest-below integer number of pixels,
+// but values between zero and one device pixels are always rounded up to
+// one device pixel.
 #define NS_ROUND_BORDER_TO_PIXELS(l,tpp) \
-  ((l) == 0) ? 0 : PR_MAX((tpp), ((l) + ((tpp) / 2)) / (tpp) * (tpp))
+  ((l) == 0) ? 0 : PR_MAX((tpp), (l) / (tpp) * (tpp))
 // Outline offset is rounded to the nearest integer number of pixels, but values
 // between zero and one device pixels are always rounded up to one device pixel.
 // Note that the offset can be negative.

layout/style/test/test_bug412901.html

@@ -29,7 +29,7 @@ var computedStyle = document.defaultView.getComputedStyle(div, "");
 is(computedStyle.borderLeftWidth, "1px");
 is(computedStyle.borderRightWidth, "0px");
 is(computedStyle.borderTopWidth, "2px");
-is(computedStyle.borderBottomWidth, "6px");
+is(computedStyle.borderBottomWidth, "5px");
 
 var div2 = document.getElementById("testDiv2");
 var computedStyle2 = document.defaultView.getComputedStyle(div2, "");