Ability to preview images in tmux

[BigBrotherJu]

Image preview in tmux is doable for kitty using unicode placeholder, not sure about other terminal emulators.

Currently, tmux(3.4) image preview is not working in joshuto(0.9.8)+kitty(0.33.1). The preview column does not display anything.

[benjajaja]

Should work with #19, I will make a PR on joshuto.

[benjajaja]

made a PR kamiyaa/joshuto#553

[ErrorNoInternet]

Hi, I'm still not seeing anything in tmux 3.4 + kitty 0.36.1 on the main branch (297efaa75f082fee3d6741f53370fd00782e5244) of joshuto and iamb 0.0.10.

When I select a message in iamb, the image gets highlighted too, but I still can't see the actual image.

[Nemo157]

I think the \x1bPtmux etc. modifications need to be applied to the string generated in kitty::transmit_virtual, at least it looks like kitten icat is doing something similar when I inspect its output.