See video example in URL field:

When I try to re-size a transition of any kind in the timeline, on any kind of clip, it won't allow me to re-size then length of the duration. Moving it around is fine, but no re-size.

Reproducible: Always

Steps to Reproduce:
1. Add clips to timeline
2. Add transitions onto those clips
3. Move mouse over transition edges to try and re-size their length.

Actual Results:  
Cannot resize the length. Mouse doesn't show that its function is changing to re-size.

Expected Results:  
Should re-size length like normal.

 Tested while using Kdenlive 15.13.0 git master on Fedora 23 x64, GNOME 3.18.