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'?