No dialog Test during debugging
 

This might almost constitute a bug :-)

If the dialog for a step is opened while paused during debugging and the dialog is exited by clicklin the Test button no action appears to be taken and there is no indication to the user that this might be a bad thing to do during debugging.

A few possible fixes suggest themselves:

1/ Allow the operation to proceed (this would be nicest, but I can see it may be tricky).

2/ Show a message box, or at least a message window entry, indicating that Test is not available during debugging.

3/ Disable the Test button (this may be combined with 1 so that tricky stuff is disabled but easy stuff can be done).

It is a bug, but a fairly harmless one. Any changes made to the step are applied, but the Rebuild Selected of that step no-ops because that action is disabled during a build. Since the only way to perform a Rebuild Selected of that step would be to abort the current build first, it's probably best to just disable the button while a build is active.