Add option to disable auto hide on pumvisible

[deathbeam]

I like to always see the shadow text even when completion menu is open. Other integrations like intellij one have this as option as well.

[deathbeam]

Hmm this is probably still missing something because the suggestions are not updating while typing while complete menu is enabled. Btw even copilot.vim has this, just not advertised, via vim.g.copilot_hide_during_completion

[deathbeam]

Alright looks like the problem was that the update was handled in CursorChangedI so I also added TextChangedP and now it works properly

[speelbarrow]

+1 to this