vimrc: Turn on persistent undo

On a couple of occasions I've thought it would be useful to have this,
so let's activate it.

1 files changed, 4 insertions, 0 deletions

diff --git a/vimrc b/vimrc
index 10ec759..f2c62ab 100644
--- a/vimrc
+++ b/vimrc
@@ -417,6 +417,7 @@
 "
 "   2019.06.01:
 "       * Add `<leader>tc` mapping to close current tab.
+"       * Turn on 'undofile' for persistent undo.
 "
 
 
@@ -481,6 +482,9 @@ set undodir=~/.vim/backup/undo//
 " Preserve file attributes, like creation date
 set backupcopy=yes
 
+" Turn on persistent undo
+set undofile
+
 " Disable all default ftplugins
 " http://vim.wikia.com/wiki/File_type_plugins#Disabling_default_ftplugins
 " http://stackoverflow.com/questions/11337129/setting-buffer-specific-variables-in-vim#comment14956146_11351393