tree view, more tweaking

[Janek Kozicki]

Hi,

I was working to improve the tree view feature, please have a look at
my video:

http://janek.kozicki.pl/nn/mc-tree-view.mpg

It is now quite intuitive.

Problem is that my knowledge of mc code is weak and I have
implemented it, most likely, in a very inefficient way. I would be
extremely happy however if you would consider applying this patch,
after your review (and some cleaning perhaps).

I hope that this patch will apply to HEAD version, because I was
working on "4.7.0.1-42-g901def1"

best regards
-- 
Janek Kozicki                               http://janek.kozicki.pl/  |
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