Discarding changes on an file open twice in split buffers crashes Femto-Emacs

[siraben]

Reproducing the following steps produces a segfault

1. Open a file in Femto-Emacs (e.g. main.c)
2. Split the buffer with C-x 2, the file should now be open in two buffers
3. Make a change
4. Kill the buffer with C-x k and answering y
5. Move to the other buffer with C-x o
6. C-x k and answering y produces the segfault.

What's interesting is that doing step 6 but answering n does not crash Femto-Emacs.

[hughbarney]

Agreed this is a bug. fix is fairly simple. What is happening is that the code is not checking if any other window has a reference to the buffer that is being killed in the current window. It is probably about a 10 line fix. Will fix in the Femto repository when I get time. https://github.com/hughbarney/femto