Adjust delta calculations based on new origin and scale

[marco00petrucci]

When zooming an image, the transform-origin is updated, but deltaX and deltaY are not compensated for this shift. This causes the image to jump/glitch when trying to pan it right after zooming.

Fix
Added a mathematical compensation for the transform-origin shift inside the zoomPan function, just before calling pan(deltaX, deltaY). I also have a video of the bug if needed.

[midzer]

Thanks for your contribution, @marco00petrucci

Would be nice, if you share your video.

Right now, I don't understand the jump/glitch for pan after zoom.

[marco00petrucci]

Try zooming in and out into the corner of an image with your mouse and you'll see it doesn't work right:
https://github.com/user-attachments/assets/42e26fe9-61f4-4c74-bc73-b1b0420db1c2

[midzer]

Okies, let me reproduce it locally with and without your patch.

I'll check back then!

[midzer]

D'oh, I forgot to test your changes and put it in current release.

Please be patient :)