Version information

• 25.01
• Issue started happening between v23.08.1 (3d3b48e on master) and v23.09 (b6dd5cd on master)

Describe the bug
When resizing a window with a long scrollable list, the scrollbar thumb jumps in size at a certain point – when the window goes bellow a certain height, the scroll thumb suddenly becomes larger. The point at which this happens seems to depend on the size of the scrollable list.

To Reproduce

1. Open a window with a scrollable list that has a good number of items. For example: the Industries window after starting a Great Britain & Ireland scenario.
2. Click and drag the bottom-right of the window to resize it.

Expected behaviour
The scrollbar thumb shouldn't jump in size. I believe it should either:

1. Continue shrinking with no discontinuities until it is so small that you cannot see it, like in original (Steam).
2. Or, it should reach a minimum size and stay at that size, without jumping in size.

Screenshots Video
https://github.com/user-attachments/assets/8edbbb55-b595-4b90-9628-8ee72ae61560

Additional context
Issue does not occur in original Locomotion (Steam). Instead, the scroll thumb just became unusably tiny.