This is a standard behavior for any history-enabled app
(like web browser). When there is no previous or next item
in the history, the appropriate button on the toolbar
is disabled.
* Replaced the search via dictionary name by search via dictionary id, cleanup
* Renamed "Dictionaries Pane" --> "Results Navigation Pane"
* Added to CREDITS
* TODO note about code duplication
It is a separate detacheable pane, which could also be enabled/disabled,
it tracks the current tab's contains, and lists those dictionaries that
contributed their content to the current translation.
Clicking on dictionary name jumps to the appropriate article from
this dictionary, which improves the navigation flow.
The Dictionaries Pane:
* Shows both dictionaries' names and icons.
* Does not consume resources when hidden.
* Properly styled.
* Properly handles app-wide shortcuts
(Esc, Ctrl-L, Alt-D, Enter, Alt-Up/Down).
This one can only play .wav files, but is far more stable than Phonon.
Any existing installations would auto-switch from Phonon to this one.
Any attempt to play a non-wav file would suggest switching to Phonon.
