Visual artifacts when running in some terminal emulators

Hi!

Recently I have built fresh vim 8.2 to use it's embedded terminal feature, and I started to notice some weird artifacts when inserting text. It's like vim forgets to redraw the screen or something. For example, here is a screenshot right after I run "vim-8.2 -u NONE" and hit "i" to start inserting text:

https://i.imgur.com/mHq18Ni.png

Note that I didn't actually enter anything after hitting "i". Also note that welcome screen text is still present on the screen — it must disappear when you switch to the insert mode. When I hit Ctrl+L, the artifacts disappear, but they come back every time I start inserting.

I observe the problem only when I run vim inside terminator. When I use xterm, everything works fine. It also works well when I run vim inside GNU screen. There is no such issue with vim version 8.0.197 running inside the same terminator.

I really like new features of vim 8.2. How can I work around this glitches, besides always starting vim inside GNU screen?

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