Bugs when Interacting with mbbill/undotree

[rennsax]

Describe the bug
mbbill/undotree uses an extra buffer to show diff information like this:

The buffer appears on the tabufline, which is expected.

However, when the undotree is toggled down, the buffer remains:

When I tried to view the buffer with or mouse click, Neovim immediately crashed.

To Reproduce
Steps to reproduce the behavior:

1. Install mbbill/undotree.
2. Open an arbitrary file.
3. Open undotree, then close.
4. Press , or click to the diff buffer. Neovim immediately crashes.

Expected behavior
The buffer shouldn't appear on the tabufline after undotree is closed.

Screenshots
Above.

Desktop (please complete the following information):

• Operating System: macOS 14.3.1
• Terminal: iTerm2 / Neovide
• Version of Neovim: v0.9.5

Additional context
None.

[siduck]

undotree uses eventignore... its hard to track it :/

mbbill/undotree#174

[siduck]

@akinsho how do you handle such edgecases?