- 
    
Bug
 - 
    Resolution: Done
 - 
    
P3: Somewhat important
 - 
    Qt Creator 3.6.0
 - 
    None
 - 
    Arch linux with kernel 4.4.1
Qt Creator 3.6.0 built with Qt 5.5.1 
Reproduction steps
- Open a new Model
 - Add any type of component
 - Left click and hold any "arrow" icon to start creating an arrow
 - Drag it to an invalid place (i.e. not to some other component)
 - Right click once and then let go of the left mouse button
 - The arrow is now just hanging and is also detached from the component