I rely on deterministic behavior of keystrokes, but I'm finding something broke that.
When I'm on the 1st line of a text file (the top line displayed is line 1), and I hit "PgDn", the top line is now line 57... IOW, it moved down in the file 56 lines.
I then hit PgDn again... and now it's on line 60!!! Just 3 lines!
This correlates with the start of a function, but I don't care about that. Why did this change? How do I get deterministic behavior back?