[Feature Request] Toggle ligatures in alternate-screen mode apps

[LunarLambda]

Many programming fonts that feature ligatures don't generally look great when applied to typical line-based terminal output like shells, package managers etc. They do however tend to work much better in TUI/ncurses apps like vim, lazygit, mc, etc.

Those apps use a control sequence to enter the "alternate screen" mode, which does not have scrollback. This allows those apps to preserve the previous terminal output on exit. (smcup/rmcup control sequences).

It would be awesome if wezterm was able to toggle font features (or possibly even fonts) when entering/exiting the alternate screen mode, so that I could have e.g. ligatures ON in vim, but ligatures OFF otherwise.

Maybe this is something that can already be implemented in Lua, I'm not sure.