Support gui_widgets

[akiyosi]

This PR supports the generic image and text label display plugin gui_widgets.nvim, created by @yatli, for the Neovim GUI frontend.

[yatli]

Nice gopher potatoe :p
Glad to see the progress here!

[bezmi]

Have you got a little time to explain how to test this (like in your screenshot)? I have tried installing @yatli plugin and opening/reloading a markdown file, but i see no changes to the rendering. I have been able to get the same functionality working in fvim with the olugin in the gui_widgets repo (albeit buggy) so i wanted to compare the two.

[akiyosi]

@bezmi
Thanks for the info.
If you have installed gui_widgets.nvim, you should be able to open the markdown file and see gui_widgets without any additional configuration required.

In my environment, I have added "-k" to the curl options, but if you are having no problems with fvim displaying images, etc in your environment, then you should not need to do this either.

I think there is something wrong with the current implementation.
By the way, what is your OS?

[bezmi]

I'm on archlinux, testing using build artifacts from your latest push and the latest HEAD of neovim. Turns out launching directly from the shell with goneovim filename.md doesn't work. If I launch goneovim and then navigate to the file, the widgets are rendered. Since I was testing anyway, I've attached a screencast of how it behaves for your reference. Happy for you to @ me for testing.

Screencast.from.09-24-2022.03.10.25.PM.webm

[akiyosi]

@bezmi
Thanks for the info.
I have also checked, and indeed gui_widgets does not display well in the use case where a markdown file is specified at startup, like the following.

/path/to/goneovim SOMEFILE.md

Perhaps this is due to the markdown file being loaded before the RPC connection process in the internal initialization process.
I understand that this is the same situation in fvim as well.