dag: wrap long lines

Signed-off-by: David Aguilar <davvid@gmail.com>
dag: fix restoring the saved 'count'

Always set the 'count'.  The old construct was not always getting into
the else: block.  Simplify it.

Signed-off-by: David Aguilar <davvid@gmail.com>
dag.model: avoid notifications when nothing changed

Suppress the 'count_updated' notification when the 'count' value is
unchanged from its original state.  This prevents updating the GUI when
it is not needed.

Signed-off-by: David Aguilar <davvid@gmail.com>
dag: make 'Ctrl-l' focus the search field

Signed-off-by: David Aguilar <davvid@gmail.com>