--PlasmaExtended::Theme produces QRegions based on corners
radius that can be consumed afterwards from Effects calculations
in order to provide correct QRegions for custom backgrounds
produced from custom background radius option
--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
--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.
--following plasma approach and use always
even for !compositing mode the widgets/panel-background
svg file. This way when Latte and Plasma panels are
combined there is uniformity between them.
BUG: 406597
Michail Vourlakos