[Bug]: The padding of PaperScroller's "scrollWhileDragging" is measuring incorrectly the position of the cursor (part 2)

What happened?

This is an issue closely related to https://github.com/clientIO/joint/issues/1779 (which I opened last year), hence I'll use the code that I provided there.

I found out that if the paperscroller is zoomed, the padding that is used to trigger the scrollWhileDragging feature is wrongly calculated.

If I set the zoom to 0, the scrolling starts once the cursor surpasses the red border:

https://github.com/clientIO/joint/assets/89727/02ec4657-95d0-4c47-a144-d84061ab7ab1

But if I set the zoom to '1.5', the padding is wrongly calculated and the scrolling starts way before the cursor has reached the red border:

https://github.com/clientIO/joint/assets/89727/dc9ad17e-7fad-4184-9543-2d9a3796df46

Code with the poc: https://codesandbox.io/s/rappid-paperscroller-bug-zoom-z4zdqf

Version

3.7.5

What browsers are you seeing the problem on?

Firefox, Chrome, Safari

What operating system are you seeing the problem on?

Mac

Start with the PaperScroller implementation and the scrollWhileDragging path, using the linked CodeSandbox to reproduce the behavior at zoom 0 and 1.5. Compare where the cursor position and padding are calculated, then verify that scrolling begins at the expected border in the reported browsers and zoom levels.