fix #983,expose latte availability to applets

--allow the applet developers to set at their
applet main file:

property bool disableLatteParabolicIcon: true

in order to disable any Latte functionality
concerning the parabolic icon

-- allow the applet developers to set at their
main file:

property bool isInLatte: false

in order to be informed by Latte when they are
in a Latte containment. For what ever purposes
the developers need to adjust to their plasmoid.

containment/package/contents/code/AppletIdentifier.js

@@ -9,7 +9,7 @@ function typeOf(obj, className){
 }
 
 function reconsiderAppletIconItem(){
-    if (container.appletIconItem || !applet)
+    if (container.appletIconItem || !applet || container.disableLatteParabolicIconHeuristics)
         return;
 
     //! searching to find for that applet the first IconItem

containment/package/contents/ui/applet/AppletItem.qml

@@ -44,6 +44,7 @@ Item {
     property bool canBeHovered: true
     property bool canShowAppletNumberBadge: !isSeparator && !isHidden && !isLattePlasmoid
                                             && !isSpacer && !isInternalViewSplitter
+    property bool disableLatteParabolicIconHeuristics: applet && applet.disableLatteParabolicIcon !== undefined ?  applet.disableLatteParabolicIcon : false
     property bool inFillCalculations: false //temp record, is used in calculations for fillWidth,fillHeight applets
     property bool needsFillSpace: { //fill flag, it is used in calculations for fillWidth,fillHeight applets
         if (!applet || !applet.Layout ||  (applet && applet.pluginName === "org.kde.plasma.panelspacer"))
@@ -80,8 +81,7 @@ Item {
                                                                                          (((index === layoutsContainer.startLayout.beginIndex+layoutsContainer.startLayout.count-2)&&(layoutsContainer.startLayout.count>2))
                                                                                           ||((index === layoutsContainer.mainLayout.beginIndex+layoutsContainer.mainLayout.count-2)&&(layoutsContainer.mainLayout.count>2))
                                                                                           ||((index === layoutsContainer.endLayout.beginIndex+layoutsContainer.endLayout.count-1)&&(layoutsContainer.endLayout.count>1)))
-
-
+    property bool supportsIsInLatte: applet && applet.isInLatte !== undefined ? true : false
 
     property int animationTime: root.durationTime* (1.2 *units.shortDuration) // 70
     property int hoveredIndex: layoutsContainer.hoveredIndex
@@ -164,6 +164,18 @@ Item {
         }
     }
 
+    onDisableLatteParabolicIconHeuristicsChanged: {
+        if (disableLatteParabolicIconHeuristics && applet.opacity === 0) {
+            applet.opacity = 1;
+
+            wrapper.disableScaleWidth = false;
+            wrapper.disableScaleHeight = false;
+
+            wrapper.updateLayoutWidth();
+            wrapper.updateLayoutHeight();
+        }
+    }
+
     /// BEGIN functions
     function activateAppletForNeutralAreas(mouse){
         //if the event is at the active indicator or spacers area then try to expand the applet,
@@ -355,6 +367,12 @@ Item {
         }
     }
 
+    onSupportsIsInLatteChanged: {
+        if (supportsIsInLatte) {
+            applet.isInLatte = true;
+        }
+    }
+
     Component.onCompleted: {
         checkIndex();
         root.updateIndexes.connect(checkIndex);

containment/package/contents/ui/applet/AppletItemWrapper.qml

@@ -431,7 +431,7 @@ Item{
         ///Secret MouseArea to be used by the folder widget
         Loader{
             anchors.fill: parent
-            active: container.fakeIconItem && applet.pluginName === "org.kde.plasma.folder"
+            active: container.fakeIconItem && applet.pluginName === "org.kde.plasma.folder" && !container.disableLatteParabolicIconHeuristics
             sourceComponent: MouseArea{
                 onClicked: dock.toggleAppletExpanded(applet.id);
             }
@@ -460,7 +460,7 @@ Item{
 
         Loader{
             anchors.fill: parent
-            active: container.fakeIconItem
+            active: container.fakeIconItem && !container.disableLatteParabolicIconHeuristics
             sourceComponent: Latte.IconItem{
                 id: fakeAppletIconItem
                 anchors.fill: parent