fix interaction ScrollArea/SectionScroller

fix the behaviour of the interaction between ScrollArea and SectionScroller, both in touch and desktop cases
make the margins correctly update based wether the scrollbar is actually visible

declarativeimports/plasmacomponents/platformcomponents/touch/SectionScroller.qml

@@ -153,6 +153,7 @@ Item {
         }
     }
     PlasmaCore.FrameSvgItem {
+        id: tooltip
         imagePath: "widgets/tooltip"
         width: sectionLabel.paintedWidth + margins.left + margins.right
         height: sectionLabel.paintedHeight + margins.top + margins.bottom
@@ -194,11 +195,22 @@ Item {
 
     }
 
+    Timer {
+        id: dirtyTimer
+        interval: 250
+        onTriggered: {
+            Sections.initSectionData(listView);
+            internal.modelDirty = false;
+            tooltip.visible = Sections._sections.length > 1
+        }
+    }
     QtObject {
         id: internal
 
+        property bool modelDirty: false
         function initDirtyObserver() {
             Sections.initSectionData(listView);
+            tooltip.visible = Sections._sections.length > 1
             function dirtyObserver() {
                 if (!internal.modelDirty) {
                     internal.modelDirty = true;

declarativeimports/plasmacomponents/qml/SectionScroller.qml

@@ -85,7 +85,7 @@ Item {
         }
     }
 
-    width: 22
+    width: 18
     Behavior on opacity {
         NumberAnimation {
             duration: 250
@@ -120,12 +120,12 @@ Item {
         interactive: true
     }
     PlasmaCore.FrameSvgItem {
+        id: tooltip
         imagePath: "widgets/tooltip"
-        width: sectionLabel.paintedWidth + margins.left + margins.right
+        width: sectionLabel.width + margins.left + margins.right
-        height: sectionLabel.paintedHeight + margins.top + margins.bottom
+        height: sectionLabel.height + margins.top + margins.bottom
         Label {
             id: sectionLabel
-            font.pointSize: theme.defaultFont.pointSize*3
             x: parent.margins.left
             y: parent.margins.top
         }
@@ -134,7 +134,7 @@ Item {
             //verticalCenter: handle.verticalCenter
             right: parent.left
         }
-        opacity: sectionLabel.text && scrollBar.pressed?1:0
+        opacity: sectionLabel.text && scrollBar.pressed ? 1 : 0
         Behavior on opacity {
             NumberAnimation {
                 duration: 250
@@ -143,11 +143,22 @@ Item {
     }
 
 
+    Timer {
+        id: dirtyTimer
+        interval: 250
+        onTriggered: {
+            Sections.initSectionData(listView);
+            internal.modelDirty = false;
+            tooltip.visible = Sections._sections.length > 1
+        }
+    }
     QtObject {
         id: internal
 
+        property bool modelDirty: false
         function initDirtyObserver() {
             Sections.initSectionData(listView);
+            tooltip.visible = Sections._sections.length > 1
             function dirtyObserver() {
                 if (!internal.modelDirty) {
                     internal.modelDirty = true;

declarativeimports/plasmaextracomponents/qml/ScrollArea.qml

@@ -64,7 +64,9 @@ Item {
     Connections {
         target: flickableItem
         onContentHeightChanged: internal.checkVerticalScrollBar()
+        onHeightChanged: internal.checkVerticalScrollBar()
         onContentWidthChanged: internal.checkHorizontalScrollBar()
+        onWidthChanged: internal.checkHorizontalScrollBar()
     }
     QtObject {
         id: internal
@@ -80,7 +82,7 @@ Item {
             if (flickableItem.contentHeight > flickableItem.height) {
                 //Do we have to change the type?
                 //from section to normal
-                if ((!flickableItem.section || !flickableItem.section.property) &&
+                if ((!flickableItem.model || flickableItem.model.get === undefined || !flickableItem.section || !flickableItem.section.property) &&
                     (!verticalScrollBar || verticalScrollBar.orientation === undefined)) {
                     if (verticalScrollBar) verticalScrollBar.destroy()
                     verticalScrollBar = verticalScrollBarComponent.createObject(root)
@@ -90,12 +92,16 @@ Item {
                     if (verticalScrollBar) verticalScrollBar.destroy()
                     verticalScrollBar = sectionScrollerComponent.createObject(root)
                 }
-
-                if (verticalScrollBar.interactive) {
-                    flickableItem.anchors.leftMargin = verticalScrollBar.width
-                } else {
-                    flickableItem.anchors.leftMargin = 0
             }
+
+            //undefined in case of SectionScroller
+            if ((flickableItem.contentHeight > flickableItem.height) &&
+                (verticalScrollBar.interactive || (verticalScrollBar.orientation === undefined &&
+                //FIXME: heuristic on width to distinguish the touch sectionscroller
+                verticalScrollBar.width < 30))) {
+                flickableItem.anchors.rightMargin = verticalScrollBar.width
+            } else {
+                flickableItem.anchors.rightMargin = 0
             }
         }
 
@@ -106,14 +112,17 @@ Item {
             }
 
             if (flickableItem.contentWidth > flickableItem.width) {
+                if (!horizontalScrollBar) {
                     horizontalScrollBar = horizontalScrollBarComponent.createObject(root)
-
-                if (verticalScrollBar.interactive) {
-                    flickableItem.anchors.leftMargin = verticalScrollBar.width
-                } else {
-                    flickableItem.anchors.leftMargin = 0
                 }
             }
+
+            if ((flickableItem.contentWidth > flickableItem.width) &&
+                horizontalScrollBar.interactive) {
+                flickableItem.anchors.bottomMargin = horizontalScrollBar.height
+            } else {
+                flickableItem.anchors.bottomMargin = 0
+            }
         }
     }
     Component {
@@ -121,6 +130,7 @@ Item {
         ScrollBar {
             flickableItem: root.flickableItem
             orientation: Qt.Vertical
+            property bool isScrollBar: true
             anchors {
                 left: undefined
                 top: parent.top
@@ -146,6 +156,7 @@ Item {
         id: sectionScrollerComponent
         SectionScroller {
             listView: root.flickableItem
+            property bool isScrollBar: false
             anchors {
                 left: undefined
                 top: parent.top