Horizontal scroll bar maximum smaller than project duration

Hello folks,

if I open OpneShot, import some clips, place them on the timeline, and try to get to the end of the timeline while the zoom is at a minimum value (largest view), I get lost somewhere in the middle of it. I have to zoom out to get to the end. The viewable area somehow shrinks with zooming in and grows with zooming out. If I try to get to the end of an one hour long timeline I just can't get to it in the largest zoom levels, first to see the end is the 13 second level. The horizontal scrollbar just has the maximum value set too low.

Is this a bug, a feature, or a known limit?

Architecture: 64bit
Linux Mint 18.3 Sonya
Installed via official DEB system package
OpenShot v. 1.4.3
melt 6.0.0
ffmpeg version N-86867-g6029b8a – own user build