Do this:
open a file, look for a long line of >100 characters that has a shorter line above or below it. Put the caret on the long line and press the End key.
Now use the mouse to click somewhere on the shorter line.
Press the arrow key up or down to get back to the longer line.
Behavior: The caret gets somewhere seemingly random on the longer line.
Expected behavior: Caret should be straight above/below where it was on the shorter line.
(If it doesn't work at once, try different lines/length/click).
This is annoying!!