[Lazarus] Several issues - Call Stack

[Hans-Peter Diettrich]

Martin schrieb:

>>> IMHO, it would be best to have it fixed....
>>
>> Perhaps in TSnapshotManager.Create, where FActive:=True seems to cause 
>> the wrong behaviour? The History Power button toggles just this property.
> 
> 
> The callstack issue is actually caused by the thread window..

Above change works for me. I don't know about other windows, which also 
may block the Call Stack when opened. For now it's sufficient that 
*never opened* windows don't block debugging.

DoDi