[patch] don't restart marquee if it's suspended

[Leo Savernik]

Hello,

I found the following issue in the marquee implementation:

When a marquee is suspended, it will be started unconditionally as soon as 
updateMarqueePosition is called.

You can test this on [1] where clicking on "stop" would suspend the marquee, 
but only until the next relayout occurred, which in turn called 
updateMarqueePosition, which in turn called start().

WebCore might be affected, too.

mfg
 Leo

[1] http://javascriptkit.com/javatutors/marquee4.shtml
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