Panel Settings Dialog (again)

[Jani Monoses]

> 
> Please tell me what you think.

A few observations:
- xfce4-mixer is grabbing the right click to zero the volume so the menu
does not show up. The panel may not do anything here, just mentioning it.

- the properties text in the menu would be more informative if it said
'launcher properties' or 'systray properties'.
It is sometime hard to know which plugin the mouse is over especially
near the systray, since plugins are touching eachother unless a
separator is explicitely put in.(gnome-panel allows unused spaces and
free placements for the plugins which can make it look a bit unorganized
but also helps in quickly getting at a plugin if it's by itself and not
stuck to others in both sides)

- move DnD is nice but the dragged image has the part of the context
menu screenshot in it at least here :) I liked 4.2 moving better but
this in turn is a lot better IMHO than moving only while the customize
panel window is open as it previously was.

-I found it a bit confusing that the whole panel is occupied by the
tasklist plugin if that is added, but can get used to it. Maybe a border
around it as in systray would be more intuitive.

Keep up the good work!

Jani