Fold closes when losing focus

[urxvtcd]

To reproduce:

1. Create two files. First is minimal.vim:

   set nocompatible
   au FocusLost * echo('Lost')
   filetype plugin indent on
   syntax on
   set hidden

   Then minimal.txt:

   " {
   " vim: foldmethod=marker foldlevel=0 foldmarker={,}
   " It's a test
   " }

2. Run gnvim on the two files:

   gnvim minimal.txt -- -u minimal.vim

3. Open the fold with za
4. Move mouse so gnvim loses focus. The fold will close.

nvim version:

NVIM v0.8.0-dev-968-g09c6ce8c4

gnvim version:

gnvim v0.1.6-88-g6ba4737

Probably related to: https://github.com/equalsraf/neovim-qt/issues/591

[vhakulinen]

Gnvim was rewritten from ground up for gtk4. If the problem persists, feel free to reopen this issue.