The basic design of Plasma is that scripts and and the shell (in theory)
manipulate a tree of basic applet geometry and configs.
Plasmashell then reacts to those changes and displays them visually with
a distinct separation between the layout and UI.
Panel's scriptengine seemed to do away with all, and try and manipulate
the graphic object directly..which might not exist and that leads to
complex code.
This changes it to read/write from the same config object as
PanelView will use. More akin to how the script engine for applet and
contiainment works.
If there's a view for this panel, we update immediately, otherwise it'll
just get loaded when it's needed. PanelView::reload() has the error
checking/bounds management so no point duplicating that.
BUG: 355918
REVIEW: 125921
David Edmundson