fix(vim.opt): Get window options before setting.

This closes #14677, but I also am a little unsure if there are times
where this may not be correct. However, this just changes the behavior
that even if `was_set` was false, we still get for
`nvim_win_get_option`.

runtime/lua/vim/_meta.lua

@@ -209,12 +209,17 @@ local function get_scoped_option(k, set_type)
   end
 
   if is_window_option(info) then
-    if vim.api.nvim_get_option_info(k).was_set then
-      local was_set, value = pcall(a.nvim_win_get_option, 0, k)
-      if was_set then return value end
+    local ok, value = pcall(a.nvim_win_get_option, 0, k)
+    if ok then
+      return value
     end
 
-    return a.nvim_get_option(k)
+    local global_ok, global_val = pcall(a.nvim_get_option, k)
+    if global_ok then
+      return global_val
+    end
+
+    error("win_get: This should never happen. File an issue and tag @tjdevries")
   end
 
   error("This fallback case should not be possible. " .. k)

test/functional/lua/vim_spec.lua

@@ -1228,6 +1228,21 @@ describe('lua stdlib', function()
       eq("only-local", result[8])
     end)
 
+    it('should allow you to retrieve window opts even if they have not been set', function()
+      local result = exec_lua [[
+        local result = {}
+        table.insert(result, vim.opt.number:get())
+        table.insert(result, vim.opt_local.number:get())
+
+        vim.opt_local.number = true
+        table.insert(result, vim.opt.number:get())
+        table.insert(result, vim.opt_local.number:get())
+
+        return result
+      ]]
+      eq({false, false, true, true}, result)
+    end)
+
     it('should allow all sorts of string manipulation', function()
       eq({'hello', 'hello world', 'start hello world'}, exec_lua [[
         local results = {}