fixes for showBackOnlyOnMaximized design

--improve applets shadows, now the shadows used
are using the backgroundColor when a transparent
panel is forced
--identify better when shadows should be drawn

app/dockview.cpp

@@ -792,8 +792,8 @@ void DockView::setBehaveAsPlasmaPanel(bool behavior)
         PanelShadows::self()->addWindow(this, enabledBorders());
     } else {
         PanelShadows::self()->removeWindow(this);
-        m_enabledBorders = Plasma::FrameSvg::AllBorders;
-        emit enabledBordersChanged();
+        // m_enabledBorders = Plasma::FrameSvg::AllBorders;
+        // emit enabledBordersChanged();
     }
 
     updateEffects();
@@ -817,8 +817,8 @@ void DockView::setDrawShadows(bool draw)
         PanelShadows::self()->addWindow(this, enabledBorders());
     } else {
         PanelShadows::self()->removeWindow(this);
-        m_enabledBorders = Plasma::FrameSvg::AllBorders;
-        emit enabledBordersChanged();
+        //m_enabledBorders = Plasma::FrameSvg::AllBorders;
+        //emit enabledBordersChanged();
     }
 
     emit drawShadowsChanged();

containment/package/contents/ui/AppletItem.qml

@@ -835,13 +835,13 @@ Item {
 
                 sourceComponent: DropShadow{
                     anchors.fill: parent
-                    color: forcedShadow ? "#ff040404" : "#ff080808"
+                    color: forcedShadow ? theme.backgroundColor : "#ff080808"
                     samples: 2 * radius
                     source: container.fakeIconItem ? wrapperContainer : container.applet
                     radius: shadowSize
                     verticalOffset: forcedShadow ? 1 : 2
 
-                    property int shadowSize : forcedShadow? 7 : Math.ceil(root.iconSize / 12)
+                    property int shadowSize : forcedShadow? 8 : Math.ceil(root.iconSize / 12)
 
                     property bool forcedShadow: root.forceTransparentPanel && applet.pluginName !== root.plasmoidName ? true : false
                 }

containment/package/contents/ui/main.qml

@@ -120,7 +120,8 @@ DragDrop.DropArea {
 
     property int panelEdgeSpacing: iconSize / 3
     property int panelTransparency: plasmoid.configuration.panelTransparency
-    property bool panelShadowsActive: plasmoid.configuration.panelShadows && !root.forceTransparentPanel
+    property bool panelShadowsActive: (plasmoid.configuration.panelShadows && !root.backgroundOnlyOnMaximized)
+                                      || (plasmoid.configuration.panelShadows && root.backgroundOnlyOnMaximized && windowsModel.hasMaximizedWindow)
 
     property int totalPanelEdgeSpacing: 0 //this is set by PanelBox
     //FIXME: this is not needed any more probably