scroll-frame-confused

From: L. David Baron <dbaron@dbaron.org>

Confused about nsHTMLScrollFrame.

diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -714,16 +714,17 @@ bool
 nsHTMLScrollFrame::InInitialReflow() const
 {
   // We're in an initial reflow if NS_FRAME_FIRST_REFLOW is set, unless we're a
   // root scrollframe.  In that case we want to skip this clause altogether.
   // The guess here is that there are lots of overflow:auto divs out there that
   // end up auto-sizing so they don't overflow, and that the root basically
   // always needs a scrollbar if it did last time we loaded this page (good
   // assumption, because our initial reflow is no longer synchronous).
+  // XXXldb eh?
   return !mHelper.mIsRoot && (GetStateBits() & NS_FRAME_FIRST_REFLOW);
 }
 
 void
 nsHTMLScrollFrame::ReflowContents(ScrollReflowInput* aState,
                                   const ReflowOutput& aDesiredSize)
 {
   ReflowOutput kidDesiredSize(aDesiredSize.GetWritingMode());