[Cin] oh, my fix for nested edl undo crash regressed video!

[Phyllis Smith]

Still can not get to crash - tested older Ubuntu 64 bit and newer Debian
32-bit.
So I will give up for now and maybe later an inspiration for a different
solution will come up.


> I tested ot like this.
>
> load some jpg image, it will expand itself as default 3 sec long timeline.
>
> "Save as" with xml extension.
>
> Load this xml as nested.
>
> hit 'undo' right away.
>
> for me  cingg crashes :(
>
>
>
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