[Patch] better fix for title attribute in image maps

[Leo Savernik]

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Hello,

I wrote a patch that fixes bug 66722 [1]. It is actually an alternative 
implementation of Jean-Baptiste's patch posted earlier on this list, but 
without the need to traverse the whole document to find the <img> that refers 
to the <area>.

To achieve it, I had to touch a number of places to record not only the 
innerNode of a mouse event, but also the innerNonSharedNode.

There are still problems which inhibit the fixing of 66722:
- - maybeTip is not called when the mouse is moved from an enclosing element's 
title to a child element's title when the child element's rectangle lies 
within the parent element's rectangle (apparently a Qt-related problem).
- - image maps on <input type=image> are not supported at all.

Please review. If nobody complains, I'll commit next week:
http://bugs.kde.org/attachment.cgi?id=6777&action=view

mfg
	Leo

[1] http://bugs.kde.org/show_bug.cgi?id=66722
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