--the new code succeeds in more cases and
trys also to handle some wrongly designed
cases such the Air plasma theme that provides
zig-zag corner shadows
--many plasma themes disable their shadows with
settings their opacity to zero instead of removing
their shadow elements. In such case the new approach
sets the hasShadow flag to zero
--the new approach is first tracking panel-background
shadows if they are available and shown in order to
identify the plasma theme panel background roundness
--Plasma::FrameSvgItem margins are not consintent
in order to provide helpful hints how plasma theme
panel-background svg is drawn properly. The new
approach calculates paddings based on top,left,bottom,right
svg elements and in that way a consistent a properly
background.minimumThickness is discovered.
Michail Vourlakos
Jonas Latza
Alexander Lohnau