The maximum width is a balancing act between showing enough text and not
being too wide. The correct answer is a matter of opinion, because some
users might use many apps with long window titles while others might
not.

The option is hidden when the applet is vertical, as it is only relevant
horizontally.

Task items are always referred to as "tasks" within this applet, both in
code and in UI, so the naming of the config variable added here also
follows that.