Scrolling issue...
Attached you will find two C files (from nDPI). If you run meld to compare the two files, you will see that meld will not allow you to scroll through the last block at the end of the files (regardless of whether you use the mouse buttons, mouse-wheel, or keyboard).
Using meld 3.20.2 and Python 3.7.6 on 64-bit Fedora 31