bug#23871: 25.1.50; Undo unexpectedly leads to blank buffer

[Markus Triska]

phillip.lord@russet.org.uk (Phillip Lord) writes:

> I'm amazed at how you spot all of these!

Thanks to your extremely nice work on these issues, I am encouraged to
file more of them. I am very glad that these issues are being corrected!

I have found more issues with undo for which I don't have reproducible
cases yet, and I can tell you more about them if you are interested.
They may depend on the exact timing of process output and user input.

> Can we start a new bug for this? We've been discussing about 4 different
> bugs on this thread, and IIUC, Eli's fixed this one.

I have filed #23903 for this, let us continue the discussion there.
It's also great that you are including these snippets as actual test
cases that are run automatically!

Thank you and all the best,
Markus