Tool bar icons always enabled

[Angelo Graziosi]

I just noticed that a few tool bar icons are always enabled. For 
example, the 'Save current buffer to its file', usually, is disabled 
(grayed) if the current buffer does not need to be saved, instead it is 
enabled (not grayed) if the buffer is modified and not yet saved. But 
now that icon is always enabled.

The same occurs with 'Undo last operation': it is always on, even if 
there is not things to be 'undoed'.

This behavior has been introduced recently because it was absent with 
the trunk build I did on 19 December 2010 and Emacs shows up it since 22 
December 2010.

Is it a regression or 'intentional'?

Happy Holidays!

Ciao,
Angelo.