[v0.9.6.E] UI rapid flipping between two scroll positions

When clicking on pixels between the scroll bar and panel body (at vertical midpoint of panel), the UI panel rapidly flips between two scroll positions.

Example of how to reproduce:

  1. Open Buildings menu.
  2. Click on Resources to expand it.
  3. At the midpoint of the panel, click and hold down on pixel at left edge of scroll bar. Shown in red in screenshot.

MP4 clip: Scroll bar flipping clip.zip (1.8 MB)