Found something strange using Notepad++, which I might call it a bug.
I was using a large file with over 1000 lines, and noticed, when scrolling past lines 999 and 1000, the screen began shaking.
At lines below 999, the horizontal scroll bar didn't show up, but when it went to 1000 or more, it appears. The bug appears when scrolling back to line 999 or less.
I made a small video demonstrating the bug.
It's not really a big deal, since if you scroll one line above the 1000 or one below the 997 it stops shaking.