expose backgroundThickness through Metrics

--this way Tasks scrolling shadows work ok again
and also they are decoupled from containment

containment/package/contents/ui/abilities/Metrics.qml

@@ -29,6 +29,7 @@ Ability.MetricsPrivate {
     //! Public Properties
     iconSize: autosizeEnabled && autosize.iconSize > 0 ? Math.min(autosize.iconSize, maxIconSize) : maxIconSize
     maxIconSize: portionIconSize!==-1 ? portionIconSize : plasmoid.configuration.iconSize
+    backgroundThickness: background.thickness
 
     margin.length: fraction.lengthMargin * iconSize
     margin.thickness: fraction.thicknessMargin * iconSize

containment/package/contents/ui/abilities/privates/MetricsPrivate.qml

@@ -28,6 +28,7 @@ ContainerAbility.Metrics {
     id: mets
     property Item animations: null
     property Item autosize: null
+    property Item background: null
     property Item indicators: null
 
     //! Private Properties

containment/package/contents/ui/main.qml

@@ -1593,6 +1593,7 @@ Item {
         id: _metrics
         animations: _animations
         autosize: _autosize
+        background: _background
         indicators: indicatorsManager
     }
 

declarativeimports/abilities/applets/Metrics.qml

@@ -26,6 +26,7 @@ AbilityDefinition.Metrics {
 
     iconSize: ref.metrics.iconSize
     maxIconSize: ref.metrics.maxIconSize
+    backgroundThickness: ref.metrics.backgroundThickness
 
     margin: ref.metrics.margin
     padding: ref.metrics.padding

declarativeimports/abilities/containers/Metrics.qml

@@ -27,6 +27,7 @@ AbilityDefinition.Metrics {
     readonly property Item publicApi: Item {
         readonly property alias iconSize: apis.iconSize
         readonly property alias maxIconSize: apis.maxIconSize
+        readonly property alias backgroundThickness: apis.backgroundThickness
 
         readonly property alias margin: apis.margin
         readonly property alias padding: apis.padding

declarativeimports/abilities/definitions/Metrics.qml

@@ -24,6 +24,7 @@ import "./metrics" as MetricsTypes
 Item {
     property int iconSize: 48
     property int maxIconSize: 48
+    property int backgroundThickness: 16
 
     property MetricsTypes.Margin margin: MetricsTypes.Margin{}
     property MetricsTypes.Padding padding: MetricsTypes.Padding{}

declarativeimports/abilities/definitions/metrics/Totals.qml

@@ -19,7 +19,7 @@
 
 import QtQuick 2.0
 
-Item {   
+Item {
     readonly property int length: iconSize + lengthEdges
     readonly property int lengthEdge: margin.length + padding.length
     readonly property int lengthEdges: 2 * lengthEdge

plasmoid/package/contents/ui/abilities/Metrics.qml

@@ -26,6 +26,7 @@ import org.kde.latte.abilities.applets 0.1 as AppletAbility
 AppletAbility.Metrics {
     //! Public Local Properties
     local.iconSize: Math.max(plasmoid.configuration.iconSize, 16)
+    local.backgroundThickness: totals.thickness
 
     local.margin.length: 0.1 * iconSize
     local.margin.thickness: 0.16 * iconSize

plasmoid/package/contents/ui/taskslayout/ScrollEdgeShadows.qml

@@ -27,7 +27,7 @@ Item {
     opacity: 0.4
 
     readonly property int gradientLength: metrics.iconSize / 3
-    readonly property int thickness: latteView ? latteView.realPanelSize : metrics.totals.thickness
+    readonly property int thickness: metrics.backgroundThickness
     readonly property color appliedColor: root.appShadowColorSolid
 
     property Item flickable