Operating system: elementaryOS 0.4.1
Graphics card: GTX 1080
Broken: 2.80, 58bfe93db614
Worked: apparently never...
Short description of error
If you change the endframe of your scene, the scrollbar in the Clip Editor's Graph and Dopesheet view does not reflect the changes.
Exact steps for others to reproduce the error
Open startup .blend
Go to Motion Tracking Layout.
Set Endframe to 1000.
Notice how the scrollbar down in the Graph View of the Clip Editor does not change its length.
Now try the same with any other Animation Editor, for example in Animation workspace
If you set the endframe to anything that makes the scene longer, the scrollbar will update accordingly and become shorter, indicating that you do not see the full range of your scene.