Bug 68015: Variables/Watch Window closes on first view

[jbb]

[snip]
> > > I think this can be implemented by making variables and framestack
> > > widget emit some other (new) signals, not 'slotSelectFrame'. Currently,
> > > slotSelectFrame does many jobs -- it's switches the frame for showing
> > > the frame in source view, it produces backtrace, and it produces info
> > > about local vars. If more specific 'slotShowBacktrace' is introduced,
> > > we can avoid accidental switching to different frame in source view.
> >
> > Does anybody disagreed that this should be done?
>
> No, was it proposed previously.

Actually, I remember now why I did it this way. Asking gdb for the local vars 
can take a long time. Once they've been asked for, I wanted to hold onto 
them, henece the tree view. So if you switch between frames and then back 
again the appropriate branch was expanded and they were not ask for again. At 
least that was the intention a few years ago now.

Showing only the current frame in the variable list is better in that the 
interface is "cleaner" for the user. We should still cache the vars though 
and redisplay the cached version if they redisplay a frame.

My kdevelop (from head) is currently crashing - something to do with 
kdirlister crashing, so  I've been unable test these patches. Can someone 
test and commit as they are done?

Thanks,

jbb