Yes...
I was guilty of harvesting that for 3.7 or 3.6... (Squeak that is).
nobody is guilty (we are not in religious stuff).
In the Old Browser, you have an entry "toggle break on entry". What this does is that it compiles a new version of the method (it uses a bit a strange way of doing that using the old AST...). This version has a self break at the beginning, yet points to the old source so you don't see it.
Now the BreakPointmanager can remove all BreakPoints, all for a class and things like that easily. it knows if there is one. CompiledMethod has #hasBreakpoint. Setting breakpoints does not invalidate code (as opposed to self halt).
So there is everything to make a nice UI for it...
The model is a bit limited. Only break on entry, no probes and so on. But it works. The limitations are mostly because everything else is hard to do with the bad model we have in the current system of doing structural reflection below method granularity...
We should add a nice UI for it *and* soon we can do oh so much better much easier :-)
May be lukas can get inspired and provide some break points support for OB :) For CodeHolder may be somebody else wants to have a look. Stef