Drag hangs after scrolling in IE 11

[anm12]

When I use dragscroll in IE, take the scrollbar to scroll and release mousebutton afterwards, dragscroll is still active. This can be reproduces in the provided example http://asvd.github.io/dragscroll/:

• take horizontal or vertical scrollbar and drag it
• release mousebutton
• hover for example "the earth"
• dragscroll is still active

The problem is, that mouseup-event is not been triggered in this case.

Do you have any suggestions to solve this problem?

Best regards,

Andi