Displayed math--vertical space

[David Antos <xantos@informatics.muni.cz>]

	Hello,

I started to typeset real math in ConTeXt :-) and the following issue
occurred in vertical positioning. I know about start/stopformula,
nevertheless I suppose that good old $$ should work, too.

\starttext
A short line followed by a formula
$$\bigcup_{1\le n}$$
a text follows in the same paragraph. The big cup is too
close to the text.

If a displayed formula has enough text above
$$\bigcup_{1\le n}$$
the problem does not appear at all. The vertical space around the formula
is very nice here.

The only difference is whether the line above the formula goes more to the
right than the beginning the formula.

\stoptext

Thanks,
D.A.

-- 
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Sir Humphrey: "Well, I for one, Minister, would be very surprised; it's
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