Context menu: improve right click

-Improve right click
-Disable context pin menu with 0 pins

Change-Id: I8f53710d85c09a624acdac370af980f3c0947190
Reviewed-by: spyro-adb <adb@spyro-soft.com>

share/qtcreator/qmldesigner/nodegrapheditor/Main.qml

@@ -294,6 +294,19 @@ Item {
                         graph.removeSelection();
                     }
                 }
+                onNodeRightClicked: node => {
+                    if (NodeGraphEditorBackend.nodeGraphEditorModel.currentFileName !== "") {
+                        contextMenu.node = node;
+                        var selectedNodes = graphView.graph.selectedNodes;
+                        if (selectedNodes && selectedNodes.length > 0) {
+                            contextMenu.node = selectedNodes.at(0);
+                        }
+
+                        const factor = (1.0 / graphView.zoom);
+                        contextMenu.newPosition = Qt.point(-graphView.containerItem.x * factor + node.item.x * factor, -graphView.containerItem.y * factor + node.item.y * factor);
+                        contextMenu.popup();
+                    }
+                }
                 onRightClicked: pos => {
                     if (NodeGraphEditorBackend.nodeGraphEditorModel.currentFileName !== "") {
                         contextMenu.node = null;

share/qtcreator/qmldesigner/nodegrapheditor/imports/Editor/ContextMenu.qml

@@ -113,7 +113,7 @@ StudioControls.Menu {
     }
 
     StudioControls.Menu {
-        enabled: node !== null
+        enabled: node !== null && pinRepeater.count > 0
         title: "Pins"
 
         Repeater {