If you apply a macro to the current project, then an Apply <macroname> to current project window appears, even if only for a short time.

Visual problems:
If it's a short macro, the the window fleetingly appears, and has no purpose - it's just a distraction.
If it's a macro containing a number of short commands, the the window appears and flashes. Again it's a distraction, and doesn't look good at all.

Screen reader problems:
When this window closes, focus returns to the tracks causing screen readers to unnecessarily read the name of the focused track. This is noise, and could be especially unwanted if the macro includes playing some of the track.

On the quality mailing list, James suggested that this window could behave like the progess dialog - it only appears after a brief pause. However, for this to be of benifit to screen readers, the implementation would have to be different than the implementation for effects. In the latter case, the destructor of the progress dialog is run regardless of whether the progress dialog is shown, and when this happens, it causes wxWidgets to create a focus event.

Do we need to have this window at all?

I have left the priority at default, so that QA can decide.