improve AddItem visual

--make it Square with small roundness in order to
fit better at all cases

containment/package/contents/ui/main.qml

@@ -1033,8 +1033,10 @@ Item {
 
         LatteComponents.AddItem{
             id: dndSpacerAddItem
-            width: root.isHorizontal ? parent.width : parent.width - metrics.margin.screenEdge
-            height: root.isHorizontal ? parent.height - metrics.margin.screenEdge: parent.height
+            width: metrics.iconSize
+            height: metrics.iconSize
+
+            property int thickMargin: metrics.margin.screenEdge + metrics.margin.thickness
 
             states:[
                 State{
@@ -1048,7 +1050,7 @@ Item {
                     }
                     PropertyChanges{
                         target: dndSpacerAddItem;
-                        anchors.leftMargin: 0;    anchors.rightMargin: 0;     anchors.topMargin:0;    anchors.bottomMargin: metrics.margin.screenEdge;
+                        anchors.leftMargin: 0;    anchors.rightMargin: 0;     anchors.topMargin:0;    anchors.bottomMargin: thickMargin;
                         anchors.horizontalCenterOffset: 0; anchors.verticalCenterOffset: 0;
                     }
                 },
@@ -1063,7 +1065,7 @@ Item {
                     }
                     PropertyChanges{
                         target: dndSpacerAddItem;
-                        anchors.leftMargin: 0;    anchors.rightMargin: 0;     anchors.topMargin: metrics.margin.screenEdge;    anchors.bottomMargin: 0;
+                        anchors.leftMargin: 0;    anchors.rightMargin: 0;     anchors.topMargin: thickMargin;    anchors.bottomMargin: 0;
                         anchors.horizontalCenterOffset: 0; anchors.verticalCenterOffset: 0;
                     }
                 },
@@ -1078,7 +1080,7 @@ Item {
                     }
                     PropertyChanges{
                         target: dndSpacerAddItem;
-                        anchors.leftMargin: metrics.margin.screenEdge;    anchors.rightMargin: 0;     anchors.topMargin:0;    anchors.bottomMargin: 0;
+                        anchors.leftMargin: thickMargin;    anchors.rightMargin: 0;     anchors.topMargin:0;    anchors.bottomMargin: 0;
                         anchors.horizontalCenterOffset: 0; anchors.verticalCenterOffset: 0;
                     }
                 },

declarativeimports/components/AddItem.qml

@@ -33,7 +33,7 @@ Item{
         height: width
         anchors.centerIn: parent
 
-        radius: Math.max(width,height)/2
+        radius: 0.05 * Math.max(width,height)
 
         color: Qt.rgba(theme.backgroundColor.r, theme.backgroundColor.g, theme.backgroundColor.b, backgroundOpacity)
         border.width: 1

declarativeimports/components/AddingArea.qml

@@ -33,6 +33,8 @@ Rectangle{
 
     property bool drawAddCross: true
 
+    property int iconSize: 64
+
     readonly property color outlineColorBase: theme.backgroundColor
     readonly property real outlineColorBaseBrightness: ColorizerTools.colorBrightness(outlineColorBase)
     readonly property color outlineColor: {
@@ -157,7 +159,8 @@ Rectangle{
         width: thickness
         height: thickness
 
-        readonly property int thickness: plasmoid.formFactor === PlasmaCore.Types.Horizontal ? (parent.height - freeSpace):(parent.width - freeSpace)
+        readonly property int thickness: Math.min(addingArea.iconSize,
+                                                  plasmoid.formFactor === PlasmaCore.Types.Horizontal ? (parent.height - freeSpace):(parent.width - freeSpace))
 
         readonly property int freeSpace: Math.max(16, (heading.implicitHeight + units.smallSpacing*2))
     }

plasmoid/package/contents/ui/main.qml

@@ -1050,6 +1050,7 @@ Item {
             radius: appletAbilities.metrics.iconSize/10
             backgroundOpacity: mouseHandler.isDroppingOnlyLaunchers || appletAbilities.launchers.isShowingAddLaunchersMessage ? 0.75 : 0
             duration: appletAbilities.animations.speedFactor.current
+            iconSize: appletAbilities.metrics.iconSize
             z: 99
 
             title: i18n("Tasks Area")