Github: Dragging vertical scroll bar resets to the top

[Arcanemagus]

Prerequisites

• Have you tried to reproduce the problem in Safe Mode?
• Have you followed all applicable steps in the debugging guide?
• Have you checked the FAQs on the message board for common solutions?
• Have you checked that your issue isn't already filed?

Description

If you drag the vertical scroll bar of the [un]staged changes as soon as the mouse is released it resets to the top position. Using the scroll wheel works normally.

Steps to Reproduce

1. Have a large enough diff that you have a vertical scroll bar.
2. Attempt to view the changes at a certain point using the vertical scroll bar.
3. Watch it reset to the top when the mouse is released.

Expected behavior:

When the mouse is released the scroll bar stays at it's current location.

Actual behavior:

When the mouse is released the scroll bar resets to the top.

Reproduces how often:

100% of the time.

Versions

Atom    : 1.22.0-beta1
Electron: 1.6.15
Chrome  : 56.0.2924.87
Node    : 7.4.0
apm  1.18.8
npm  3.10.10
node 6.9.5 x64
python 2.7.14
git 2.14.2.windows.3
visual studio

OS: Windows 10 x64 Enterprise

[Ben3eeE]

Thanks was just going to file this myself 😆

[50Wliu]

Related to #884. Going to bet they're caused by the same bug.