This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
In the debugger, it appears to me that threadgroups don't change in appearance at all when suspended, and threads merely change color when they are suspended. Aside from the fact that the color is the reverse of what I'd expect, it seems to me that there should be a more visible indication of when a thread or thread group is suspended should be used.
We already use color to show what threads were suspended - they are yellow. For thread groups this doesn't have a sense - see bug #8590.