Stepping is too slow when application has many threads

[Anderson Luiz da Silva]

Hi, first of all: I'm new here, so, please, forgive any mistake.

I'm working on an application that has many threads (40+) and stepping, 
in debug mode, takes a long time because at every step KDevelop lists 
the stack of all threads. Since I don't need to look to stacks every 
step it is very annoying.

So, I've done some modifications to the FramestackWidget that will speed 
up debugging. The .diff file is attached.

It basically moves stacks updates from when changes in gdb status occur 
to when the widget becomes visible.

It works nice to me but certainly needs more tests. I hope this to be 
useful!

Bye,
Anderson.
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