scrolling doesn't work in insert mode

[uvicorn]

https://user-images.githubusercontent.com/59787538/114911248-021a2080-9e49-11eb-815c-03048edc66e8.mp4

[WhyNotHugo]

Mouse-wheel scrolling works for me in INSERT mode (I'll admit I'd never even though of the idea of scrolling in insert mode).

How exactly are you scrolling?

[uvicorn]

shift+ up\down arrow . In my terminal it is ^[[1;2A and ^[[1;2B

[psliwka]

Note to myself: the following scrolling keys in insert mode should be supported:

<S-Up>		move window one page up			     *i_<S-Up>*
<PageUp>	move window one page up			     *i_<PageUp>*
<S-Down>	move window one page down		     *i_<S-Down>*
<PageDown>	move window one page down		     *i_<PageDown>*