fix: stop using vim.wo to set window options

vim.wo also affects the global status of the option. We only want to set
the window-local option.

lua/aerial/fold.lua

@@ -140,12 +140,12 @@ M.restore_foldmethod = function()
   local ok, prev_foldmethod = pcall(vim.api.nvim_win_get_var, 0, prev_fdm)
   if ok and prev_foldmethod then
     vim.api.nvim_win_del_var(0, prev_fdm)
-    vim.wo.foldmethod = prev_foldmethod
+    vim.api.nvim_set_option_value("foldmethod", prev_foldmethod, { scope = "local", win = 0 })
   end
   local ok2, prev_foldexpr = pcall(vim.api.nvim_win_get_var, 0, prev_fde)
   if ok2 and prev_foldexpr then
     vim.api.nvim_win_del_var(0, prev_fde)
-    vim.wo.foldexpr = prev_foldexpr
+    vim.api.nvim_set_option_value("foldexpr", prev_foldexpr, { scope = "local", win = 0 })
   end
 end
 
@@ -172,13 +172,17 @@ M.maybe_set_foldmethod = function(bufnr)
     then
       vim.api.nvim_win_set_var(winid, prev_fdm, fdm)
       vim.api.nvim_win_set_var(winid, prev_fde, fde)
-      vim.wo[winid].foldmethod = "expr"
-      vim.wo[winid].foldexpr = "v:lua.aerial_foldexpr()"
+      vim.api.nvim_set_option_value("foldmethod", "expr", { scope = "local", win = winid })
+      vim.api.nvim_set_option_value(
+        "foldexpr",
+        "v:lua.aerial_foldexpr()",
+        { scope = "local", win = winid }
+      )
       if config.link_folds_to_tree then
         local fdl = vim.wo[winid].foldlevel
         require("aerial").tree_set_collapse_level(bufnr, fdl)
       elseif config.link_tree_to_folds then
-        vim.wo[winid].foldlevel = 99
+        vim.api.nvim_set_option_value("foldlevel", 99, { scope = "local", win = winid })
       end
     end
   end

lua/aerial/nav_view.lua

@@ -287,11 +287,11 @@ function AerialNav:relayout()
     col = main_col + main_width + border_width,
   })
   for k, v in pairs(config.nav.win_opts) do
-    vim.wo[self.main.winid][k] = v
+    vim.api.nvim_set_option_value(k, v, { scope = "local", win = self.main.winid })
     -- Hack: we generally don't want the left/right to have cursorline enabled
     if k ~= "cursorline" then
-      vim.wo[self.left.winid][k] = v
-      vim.wo[self.right.winid][k] = v
+      vim.api.nvim_set_option_value(k, v, { scope = "local", win = self.left.winid })
+      vim.api.nvim_set_option_value(k, v, { scope = "local", win = self.right.winid })
     end
   end
 end

lua/aerial/tree.lua

@@ -158,7 +158,7 @@ M.set_collapse_level = function(bufnr, level)
     end
 
     for _, winid in ipairs(wins) do
-      vim.wo[winid].foldlevel = level
+      vim.api.nvim_set_option_value("foldlevel", level, { scope = "local", win = winid })
     end
   end
   _post_tree_mutate(bufnr)

lua/aerial/window.lua

@@ -80,20 +80,26 @@ local function create_aerial_buffer(bufnr)
   return aer_bufnr
 end
 
+local default_win_opts = {
+  list = false,
+  winfixwidth = true,
+  number = false,
+  signcolumn = "no",
+  foldcolumn = "0",
+  relativenumber = false,
+  wrap = false,
+  spell = false,
+}
+
 ---@param src_winid integer
 ---@param aer_winid integer
 local function setup_aerial_win(src_winid, aer_winid, aer_bufnr)
   vim.api.nvim_win_set_buf(aer_winid, aer_bufnr)
-  vim.wo[aer_winid].list = false
-  vim.wo[aer_winid].winfixwidth = true
-  vim.wo[aer_winid].number = false
-  vim.wo[aer_winid].signcolumn = "no"
-  vim.wo[aer_winid].foldcolumn = "0"
-  vim.wo[aer_winid].relativenumber = false
-  vim.wo[aer_winid].wrap = false
-  vim.wo[aer_winid].spell = false
+  for k, v in pairs(default_win_opts) do
+    vim.api.nvim_set_option_value(k, v, { scope = "local", win = aer_winid })
+  end
   for k, v in pairs(config.layout.win_opts) do
-    vim.wo[aer_winid][k] = v
+    vim.api.nvim_set_option_value(k, v, { scope = "local", win = aer_winid })
   end
   vim.api.nvim_win_set_var(aer_winid, "is_aerial_win", true)