1.11.5: mousewheel scroll up issue (see below)

[KLE-France]

XnView: MP 1.11.5 - 64 bit
OS: Windows - 64 bit

When Tools > Settings > Browser > "View scroll content by thumbnail" is checked, scrolling up with the mouse-wheel does not work if there is only one row of partially exposed thumbnails at the top (and thus no rows that have been completely scrolled out of the top of the browser window) (see "To reproduce").

Effect: Scrolling up with the mouse-wheel doesn't work (see "To reproduce").

To reproduce:
1. Make sure Tools > Settings > Browser > "View scroll content by thumbnail" is checked.
2. Find a folder where, upon opening the folder, the very-bottom row of images is partially outside of the browser window (So, there are not many images in this folder; only enough that the last row is partially out of the browser window frame).
3) Now, use the mouse-wheel to scroll down, so that you can see the entirety of the images on the bottom row.
4) This means that the top row of images is now partially outside of the browser window frame.
5) Now use the mouse-wheel to scroll back up, so that you can see the entirety of the images on the top row.

Actual behaviour (bug): The window will not scroll back up

Expected behaviour: The window should scroll back up.

This will not happen in folders where there are enough images to make at least 1 entire row scroll completely out of the browser window.

I hope I explained that clear enough!

Thanks for hearing me out!

[xnview]

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