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
at startup the panelviews can't exist yet: panelviews have to be created
after desktopviews and the script has to be executed before the desktopviews
exist.
it's a bit hackish, but use temporary dynamic properties to store those
values that will be then used as soon the panelviews are created