Support GUI font requester

[dbarnett]

On some platforms you can execute

:set guifont=*

to bring up a font requester dialog and interactively pick your font. Screenshot:

Could GNvim implement that font requester option for set guifont=*?

[smolck]

We could add that feature in theory, but I’m not sure if it’s something we want to add. It depends on how much we’re willing to stray from the keyboard-centric, Vim feeling. Such a feature, while convenient for some, may make GNvim’s overall UI a bit inconsistent. ATM GNvim is more of an enhanced Neovim, as opposed to what one would consider a traditional GUI text editor; this feature could change that, which may or may not be desired.

An alternative would be to open a keyboard-centric interface when the user enters set guifont=* (maybe like Startify’s) within GNvim which would allow the user to choose these font-related options. However, this would be more difficult, and likely outside the scope of GNvim (although a GNvim-specific plugin for this is an option).

All that being said, this feature is a convenience which I think we should look into; I’m not sure what route we want to take though, so some discussion is probably a good idea. @vhakulinen @badosu what do you think?

[justinmk]

:browse {cmd} exists already in n/vim for some commands. We could maybe add some event so that

:browse set

gives UIs a chance to handle it.

[bfredl]

Though :set guifont=* is already forwarded as-is by nvim core, i e option_set["guifont", "*"], so a GUI could handle it like gvim if it wants to.

[vhakulinen]

I did have the idea of opening gui font selector on :set guifont=*, but forgot that at some point. Shouldn't be too hard to implement either.