# Objective
Fix an issue in SSH remote mode where reopening a newly created file at
a path that was previously renamed could incorrectly reuse the buffer
for the renamed file.

## Solution

When handling UpdateBufferFile, remove the buffer's previous path from
path_to_buffer_id when the file path changes.

## Testing

Tested manually on Linux using SSH remote mode.

Reproduction before the fix:

touch A
Open A from the project panel

mv A B
touch A

Open the new A from the project panel

Before the fix, opening A reused the buffer for B.

After the fix:

B continues to use the original buffer.
The recreated A opens as a separate buffer.
Renaming an opened remote file still updates the existing buffer to the
new path correctly.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable


Release Notes:

- Fixed an issue in SSH remote mode where reopening a newly created file
at a path that was previously renamed could incorrectly reuse the buffer
for the renamed file.

---------

Signed-off-by: xiaoff <xiaoff0019@outlook.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>