Comment 20 for bug 327863

Hum, actually, I take that back. aReflowState.availableHeight is NS_UNCONSTRAINEDSIZE from the get-go; nsPresShell::DoReflow sets it up that way:

  // Don't pass size directly to the reflow state, since a
  // constrained height implies page/column breaking.
  nsSize reflowSize(size.width, NS_UNCONSTRAINEDSIZE);
  nsHTMLReflowState reflowState(mPresContext, target, rcx, reflowSize);

I wonder if it should only do that when target == rootFrame. Thoughts?

Note that this is also tripping the assertions at the end of nsPresShell::DoReflow about size changing during incremental reflow...