Do not change zoom of breakpoint while dragging breakpoint

[elanhickler]

disable this feature, very annoying.

Well, it's also broken, but I'd just disable it instead of trying to fix.

You can calculate new zoom after dragging is finished.

[RobinSchmidt]

uuh...i'm just looking at the code responsible for this. this is easier said than done. i need to study this some some more