restore Double Layout functionality

app/nowdockview.h

@@ -123,6 +123,7 @@ protected:
 
 signals:
 //   void visibilityChanged();
+    void addInternalViewSplitter();
     void alignmentChanged();
     void compositingChanged();
     void heightChanged();
@@ -131,6 +132,7 @@ signals:
     void maxLengthChanged();
     void maxThicknessChanged();
     void offsetChanged();
+    void removeInternalViewSplitter();
     void visibilityChanged();
     void widthChanged();
     

containment/contents/ui/main.qml

@@ -390,6 +390,9 @@ DragDrop.DropArea {
 
     onDockChanged: {
         if (dock) {
+            dock.onAddInternalViewSplitter.connect(addInternalViewSplitter);
+            dock.onRemoveInternalViewSplitter.connect(removeInternalViewSplitter);
+
             dock.visibility.onDisableHidingChanged.connect(visibilityManager.slotDisableHidingChanged);
             dock.visibility.onIsHoveredChanged.connect(visibilityManager.slotIsHoveredChanged);
             dock.visibility.onMustBeLowered.connect(visibilityManager.slotMustBeLowered);
@@ -1066,14 +1069,14 @@ DragDrop.DropArea {
 
         x: (plasmoid.configuration.panelPosition === Latte.Dock.Double) && root.isHorizontal
            && plasmoid.immutable && windowSystem.compositingActive ?
-               (dock.width/2) - (dock.visibility.maxLength/2): 0
+               (dock.width/2) - (dock.maxLength/2): 0
         y: (plasmoid.configuration.panelPosition === Latte.Dock.Double) && root.isVertical
            && plasmoid.immutable && windowSystem.compositingActive ?
-               (dock.height/2) - (dock.visibility.maxLength/2): 0
+               (dock.height/2) - (dock.maxLength/2): 0
         width: (plasmoid.configuration.panelPosition === Latte.Dock.Double) && root.isHorizontal && plasmoid.immutable ?
-                   dock.visibility.maxLength : parent.width
+                   dock.maxLength : parent.width
         height: (plasmoid.configuration.panelPosition === Latte.Dock.Double) && root.isVertical && plasmoid.immutable ?
-                    dock.visibility.maxLength : parent.height
+                    dock.maxLength : parent.height
 
         Component.onCompleted: {
             if(plasmoid.immutable) {

shell/contents/configuration/LatteDockConfiguration.qml.cmake

@@ -19,8 +19,6 @@ PlasmaCore.FrameSvgItem {
     property bool panelIsVertical: plasmoid.formFactor === PlasmaCore.Types.Vertical
 
     signal updateThickness();
-    signal removeInternalViewSplitter();
-    signal addInternalViewSplitter();
 
     Column{
         id:mainColumn
@@ -70,21 +68,21 @@ PlasmaCore.FrameSvgItem {
                         centerPosition.checked = false;
                         lastPosition.checked = false;
                         splitTwoPosition.checked = false;
-                        removeInternalViewSplitter();
+                        dock.removeInternalViewSplitter();
                     }
                     else if(panelPosition == Latte.Dock.Center){
                         firstPosition.checked = false;
                         centerPosition.checked = true;
                         lastPosition.checked = false;
                         splitTwoPosition.checked = false;
-                        removeInternalViewSplitter();
+                        dock.removeInternalViewSplitter();
                     }
                     else if((panelPosition == Latte.Dock.Right)||(panelPosition == Latte.Dock.Bottom)){
                         firstPosition.checked = false;
                         centerPosition.checked = false;
                         lastPosition.checked = true;
                         splitTwoPosition.checked = false;
-                        removeInternalViewSplitter();
+                        dock.removeInternalViewSplitter();
                     }
                     else if (panelPosition == Latte.Dock.Double){
                         firstPosition.checked = false;
@@ -92,7 +90,7 @@ PlasmaCore.FrameSvgItem {
                         lastPosition.checked = false;
                         splitTwoPosition.checked = true;
                         //add the splitter visual
-                        addInternalViewSplitter(-1);
+                        dock.addInternalViewSplitter();
                     }
                 }