[cdt-patch] Register View Persistence

[Chris Songer <songer@xxxxxxxxxxxxx>]

Hi,

Step through a function return and see the open groups in your register 
view close. That seems to be because the IStackFrame is different, even 
though the underlying register model is the same. (Still, the register 
model could change I suppose.) Our usability testers hated it.

So, please find attached a patch that causes the register view to remember 
what register groups are expanded and restore them to their expanded state 
across stackframe changes. The patch was based on 1.0.1. It looks to me 
like it will cleanly apply to the head, but your mileage may vary.

Thanks!
-Chris

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