update locations when dock changes location

--updates the available locations in the configuration
window when any dock updates its location

app/dockcorona.cpp

@@ -282,6 +282,7 @@ void DockCorona::addDock(Plasma::Containment *containment)
     dockView->setContainment(containment);
     connect(containment, &QObject::destroyed, this, &DockCorona::dockContainmentDestroyed);
     connect(containment, &Plasma::Applet::destroyedChanged, this, &DockCorona::destroyedChanged);
+    connect(containment, &Plasma::Applet::locationChanged, this, &DockCorona::dockLocationChanged);
     dockView->show();
     m_dockViews[containment] = dockView;
     emit docksCountChanged();

app/dockcorona.h

@@ -65,6 +65,7 @@ public slots:
 signals:
     void configurationShown(PlasmaQuick::ConfigView *configView);
     void docksCountChanged();
+    void dockLocationChanged();
 
 private slots:
     void destroyedChanged(bool destroyed);

app/dockview.cpp

@@ -83,8 +83,10 @@ DockView::DockView(Plasma::Corona *corona, QScreen *targetScreen)
     }, Qt::DirectConnection);
     auto *dockCorona = qobject_cast<DockCorona *>(this->corona());
 
-    if (dockCorona)
+    if (dockCorona) {
         connect(dockCorona, &DockCorona::docksCountChanged, this, &DockView::docksCountChanged);
+        connect(dockCorona, &DockCorona::dockLocationChanged, this, &DockView::dockLocationChanged);
+    }
 }
 
 DockView::~DockView()

app/dockview.h

@@ -117,6 +117,7 @@ signals:
     void removeInternalViewSplitter();
     void eventTriggered(QEvent *ev);
 
+    void dockLocationChanged();
     void docksCountChanged();
     void widthChanged();
     void heightChanged();

shell/contents/configuration/BehaviorConfig.qml

@@ -58,10 +58,10 @@ PlasmaComponents.Page {
                 Layout.rightMargin: units.smallSpacing * 2
                 spacing: 1
 
-                property int docksCount: dock.docksCount
+                Connections{
-
+                    target: dock
-                onDocksCountChanged: {
+                    onDockLocationChanged: locationLayout.lockReservedEdges();
-                    lockReservedEdges()
+                    onDocksCountChanged: locationLayout.lockReservedEdges();
                 }
 
                 ExclusiveGroup {