[applets/systemtray] increase spacing under header and center icons better

This way the icons of the top-most items aren't so close to the header.

applets/systemtray/package/contents/ui/ExpandedRepresentation.qml

@@ -84,6 +84,7 @@ Item {
 
             PlasmaExtras.Heading {
                 Layout.fillWidth: true
+                leftPadding: activeApplet ? 0 : units.smallSpacing * 2
 
                 level: 1
                 text: activeApplet ? activeApplet.title : i18n("Status and Notifications")

applets/systemtray/package/contents/ui/items/AbstractItem.qml

@@ -136,7 +136,10 @@ PlasmaCore.ToolTipArea {
             property alias inVisibleLayout: abstractItem.inVisibleLayout
             readonly property int size: abstractItem.inVisibleLayout ? root.itemSize : units.iconSizes.medium
 
-            Layout.alignment: Qt.AlignHCenter
+            Layout.alignment: Qt.Bottom | Qt.AlignHCenter
+            // use 50% of available height
+            Layout.preferredHeight: abstractItem.inHiddenLayout ? 50 : undefined
+            Layout.fillHeight: abstractItem.inHiddenLayout ? true : false
             implicitWidth: root.vertical && abstractItem.inVisibleLayout ? abstractItem.width : size
             implicitHeight: !root.vertical && abstractItem.inVisibleLayout ? abstractItem.height : size
             Layout.topMargin: abstractItem.inHiddenLayout ? units.smallSpacing : 0
@@ -145,6 +148,8 @@ PlasmaCore.ToolTipArea {
             id: label
 
             Layout.fillWidth: true
+            // use 50% of available height
+            Layout.preferredHeight: 50
             Layout.fillHeight: true
             Layout.leftMargin: abstractItem.inHiddenLayout ? units.smallSpacing : 0
             Layout.rightMargin: abstractItem.inHiddenLayout ? units.smallSpacing : 0
@@ -152,7 +157,7 @@ PlasmaCore.ToolTipArea {
 
             visible: abstractItem.inHiddenLayout && !root.activeApplet
 
-            verticalAlignment: Text.AlignVCenter
+            verticalAlignment: Text.AlignTop
             horizontalAlignment: Text.AlignHCenter
             elide: Text.ElideRight
             wrapMode: Text.Wrap