Version:           2.5.0 (using KDE 4.7.4) 
OS:                Linux

Testing in 2.5, an odd usablity issue with the queue 'mode' arises, in previous version as well.

When selecting "Only queue" play mode and dbl-clicking a track in playlist
(nothing in queue), the track plays -- ok this is fine.  
But when track finishes, clicking on play button, the action hangs with play button depressed -- 'ahh, what's happening?'.  Clicking play button again releases/ undepresses, with no action.

The play button should either pop back and/or a warning "Queue Empty" (or could revert to "Standard" play-mode).

This will/can confuse any user not thinking an empty queue is being selected as play source.


Reproducible: Always

Steps to Reproduce:
Add track(s) to playlist
Select 'play-mode' to "Only queue"
(note: nothing in queue)
dbl-click track to play, wait till finish (skip to end..)
click play button


Actual Results:  
play button depressed with no action

Expected Results:  
play current track, or no action with warning