add fullscreen setting

config.lua

@@ -95,6 +95,14 @@ add_setting("Audio", "background_preview_sound_volume", 0, {
 })
 add_setting("General", "preload_all_packs", false)
 add_setting("Display", "fps_limit", 200, { min = 30, max = 1001, step = 5 })
+add_setting("Display", "fullscreen", "exclusive", {
+    options = { "exclusive", "borderless", "windowed" },
+    onchange = function(value)
+        if love.window and love.window.isOpen() then
+            love.window.setFullscreen(value ~= "windowed", value == "borderless" and "desktop" or "exclusive")
+        end
+    end,
+})
 add_setting("Gameplay", "official_mode", true, { game_version = { 192, 20, 21, 3 } })
 add_setting("Audio", "sound_volume", 1, { game_version = { 192, 20, 21, 3 }, min = 0, max = 1, step = 0.05 })
 add_setting("Audio", "music_volume", 1, { game_version = { 192, 20, 21, 3 }, min = 0, max = 1, step = 0.05 })

main.lua

@@ -183,6 +183,8 @@ local main = async(function()
     ui.open_screen("loading")
     local game_handler = require("game_handler")
     global_config.init()
+    -- apply fullscreen setting initially
+    config.get_definitions().fullscreen.onchange(config.get("fullscreen"))
 
     local fps_limit = config.get("fps_limit")
     local delta_target = 1 / fps_limit