Update src/rviz/default_plugin/interactive_markers/interactive_marker_control.cpp

added check to see if mouse_dragging_ is true (which would mean we are dragging the mouse) before calling mouseMoveEvent callback.
This fixes a problem where the right clicking on an interactive marker to bring up a menu and then clicking on the marker with the left button would drag the marker as though the mouse had dragged from the point of the right click.
Merge branch 'interactive_marker_jump_fix' of github.com:jon-weisz/rviz into groovy-devel
interaction tool: ignore mouse events while context menu visible
int. marker control: removed unused member var