I have bound some keys to resizing windows. This works fine when no external display is attached. But resizing a window using the keyboard when an external display is attached is broken: the mouse pointer jumps to the far right edge of the screen on the display on the right, but works as expected when resizing on the display on the left. If I have the external display above the laptop screen, the pointer warps to the bottom of the screen.
This doesn't occur if I trigger keyboard resize from the window menu.
Changing the focus policy to "Click" also prevents this behavior. Pointer or Sloppy focus have this problem.
"Prevent all forms of pointer warping" eliminates this behavior too.
My keybindings resize windows by "100 0", "-100 0", "0 100" and "0 -100".