nvim: only run colorcolumn function on tw change

.config/nvim/lua/coding.lua

@@ -28,7 +28,7 @@ vim.api.nvim_create_autocmd(
         pattern = { 'gitcommit', 'gitrebase' },
         callback = function()
             -- FIXME: why does the autocmd in settings.lua not set it?
-            vim.wo.colorcolumn = tostring(vim.o.textwidth)
+            vim.opt_local.colorcolumn = tostring(vim.o.textwidth)
             vim.cmd([[startinsert | 1]])
         end
     })

.config/nvim/lua/settings.lua

@@ -32,15 +32,15 @@ packer.use 'https://github.com/editorconfig/editorconfig-vim'
 -- set colorcolumn to textwidth after buffer is displayed or option is changed
 vim.api.nvim_create_augroup('config_settings', { clear = true })
 vim.api.nvim_create_autocmd(
-    { 'BufWinEnter', 'OptionSet' },
+    { 'OptionSet' },
     {
         group = 'config_settings',
         pattern = { 'textwidth' },
         callback = function()
             if vim.o.textwidth > 0 then
-                vim.wo.colorcolumn = tostring(vim.o.textwidth)
+                vim.opt_local.colorcolumn = tostring(vim.o.textwidth)
             else
-                vim.wo.colorcolumn = ''
+                vim.opt_local.colorcolumn = ''
             end
         end
     }