> > You need to enable that with "resize" and "drag". 
> 
> I've done that, but it's very possible I'm overlooking something or my 
> environment is quirky. I've tried opening vim in/out of tmux, with/out a 
> .vimrc and almost every variation of the optional configs I can think of. 
> I'm using Debian 10, i3 version 4.16.1 and vim patch 8.1.1944.
> 
> Here's a screencap of the behavior I see: 
> https://www.dropbox.com/s/ooc18fc0hmzi5ej/vim-popup-resize-drag.ogv?dl=0

The command is right, and it works for me. Thus there is something wrong
with mouse events in your setup.  Probably drag events don't work.
I have seen that with some terminal emulators.

-- 
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        EHUH            Unexpected error
        EUSER           User error, not our fault!
        EGOD            Horrible problem, god knows what has happened
        EERR            Errornous error: nothing wrong

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