v0.13.4 introduced a regression where lines weren't always cleared when
resizing the window resulting in the presence of rendering artifacts.
This commit fixes that.
If the number of lines increased there's a chance that the increase in
lines caused the terminal to scroll (even in the altscreen). Because of
this we must repaint everything, as skipping lines will mis-render.
Thanks to @fiws for reporting this bug.
The Nil Renderer essentially disables the Bubble Tea renderer sending
loggings and print statements to stdout. It can be enabled via the
ProgramOption WithoutRenderer.