Can I see changes before I save my file in Vim?

Question

I use Vim. I open a file. I edit it and I want to see what I\'ve edited before I save it.

How can I do this in Vim?

Answer 1

There is a plugin, based on different answers here: https://github.com/gangleri/vim-diffsaved

It provides the :w !diff % - method and the more involved diffthis one.

Apart from that undotree allows this as well, but also much more (diffs between different undo checkpoints). Similar to Gundo.