feat(indent): Add undo_indent variable

Author: kristijanhusak

indent/org.lua

@@ -8,3 +8,9 @@ vim.bo.indentexpr = 'v:lua.require("orgmode.org.indent").indentexpr()'
 vim.bo.lisp = false
 vim.bo.smartindent = false
 vim.bo.autoindent = true
+vim.b.undo_indent = table.concat({
+  'setlocal indentexpr<',
+  'lisp<',
+  'smartindent<',
+  'autoindent<',
+}, ' ')