nvim: statusline: Do not set winbar for floating windows

nvim/.config/nvim/after/plugin/statusline.lua

@@ -252,6 +252,12 @@ api.nvim_create_autocmd({"WinLeave" , "BufLeave"}, {
 api.nvim_create_autocmd({"BufWinEnter", "BufFilePost"}, {
   group    = status_id,
   callback = function()
+    -- Skip floating windows
+    -- Idea taken from https://github.com/itchyny/lightline.vim/pull/552
+    if api.nvim_win_get_config(0).relative ~= '' then
+      return
+    end
+
     local winbar_filetype_exclude = {
       "diff",
       "fugitive",