[ui] AlembicLoader: only select cameras on still left-clicks

don't trigger Camera selection if mouse has moved to rotate camera

meshroom/ui/qml/Viewer3D/AlembicLoader.qml

@@ -57,10 +57,22 @@ AlembicEntity {
                 },
                 ObjectPicker {
                     id: cameraPicker
-                    onPressed: pick.accepted = cameraPickingEnabled
+                    property point pos
-                    onReleased: _reconstruction.selectedViewId = camSelector.viewId
+                    onPressed: {
+                        pos = pick.position;
+                        pick.accepted = (pick.buttons & Qt.LeftButton) && cameraPickingEnabled
+                    }
+                    onReleased: {
+                        const delta = Qt.point(Math.abs(pos.x - pick.position.x), Math.abs(pos.y - pick.position.y));
+                        // only trigger picking when mouse has not moved between press and release
+                        if(delta.x + delta.y < 4)
+                        {
+                            _reconstruction.selectedViewId = camSelector.viewId;
+                        }
+                    }
                 }
             ]
         }
+
     }
 }