Forbit move if file unsaved

[MarcelRobitaille]

I have gotten bitten multiple times by renaming a file before realizing I hadn't saved it. I think NERDTree should warn against this (maybe have you type the whole file name, as GitHub does when deleting a repository).

Environment

• Operating System: 4.20.7-arch1-1-ARCH
• Vim version :version: 8.1
• NERDTree version git rev-parse --short HEAD: 72c3656

Process

1. Make changes to a buffer
2. Rename it in NERDTree before saving
3. Hit y out of habit

Current Result

The unsaved buffer is closed and a new one is opened with the contents of the file from disk, resulting in your changes being lost.

Expected Result

NERDTree should not allow this, forcing you to save the buffer or explicitly discard changes.

I apologize if I am overlooking something obvious. I know I could probably recover the buffer, but I just lost one through my own stupidity (renamed the file back).