When debugging, I tend to leave the Breakpoints window on top - since it seems
to have the least "overhead". (When the stack or locals windows are open,
especially the stack, the IDE seems to do a lot more work for each single step.)

Usually I don't have the Threads window open at all. But if I do open it to look
at the threads, and then put the Breakpoints window on top, the Threads window
fronts itself at various times! I haven't determined exactly what causes it, but
I believe restarting the debugger does it, and perhaps other actions as well.

I believe the only time a debugger window should front itself is if some user
action has added a relevant object: For example, adding a breakpoint in the
Breakpoints dialog should front the breakpoints window, and adding a Watch
should front the Watch window.

I'm marking this as a defect rather than an enhancement because this is a
usability bug.