Support for snacks.nvim image as image provider

[sg1fan]

Hello. Thanks for this amazing plugin. The only issue I've ever had was with rendering images. With image.nvim, I've always had issues with image rendering particularly with tmux (such as flickering, duplicated images, images out of position, images remaining in the terminal even when switching panes, poor performance, etc), but snacks.nvim works out of the box for me without any issues and with better performance. Could we see some support perhaps?

[benlubas]

I welcome someone to submit a PR.

I don't have much time or motivation to do this. But it shouldn't be very hard (hopefully). It seems like snacks supports unicode placeholders, which would make it very easy to add support

[vekkt0r]

Made some prototyping to add snacks.nvim image provider here vekkt0r@e4da1d0

Having some issues with getting predictable size / padding of rendered images but solves the immediate issue of stuck images with image.nvim for me. Also seems like the canvas is redrawn on every tick with the default molten_output_show_exec_time setting which causes some flickering.

Related upstream issue for the image.nvim issues 3rd/image.nvim#233

[benlubas]

the canvas is redrawn on every tick with the default molten_output_show_exec_time setting which causes some flickering

That's a bug. If you can fix it, that would be appreciated

[bowentan]

I made an implementation with some fix regarding the bug mentioned here in #299