- Open an image
- Draw a planar line
- Click and drag one of the handles to the image border and beyond so that the mouse pointer is separated from the handle and release it
- BUG: The line is still in hover state
This is only the easiest way to reproduce it but it affects all situations where the mouse pointer leaves the hover area right out into "out of scene" space.
Also, when saving the project, the hovering state (which is a property) is serialized but it should not.