A modified fileless buffer gets deleted without confirmation

[duianto]

Description :octocat:

Any text that has been written in a new buffer, that hasn't been saved to a file yet, will be lost right away if one deletes that buffer, because there's no confirmation before it gets deleted.

Reproduction guide :beetle:

• Start Emacs
• Open a new buffer SPC b N
• Add some text, f.ex. a lorem ipsum paragraph: SPC i l p
• Delete the buffer SPC b d

Observed behaviour: :eyes: :broken_heart:

The buffer gets deleted instantly without asking for confirmation first.

Expected behaviour: :heart: :smile:

It should probably ask for confirmation first.

Possible prompt message (or something better):

• This buffer isn't associated with a file, kill it anyway? (y or n)
• This buffer has not been saved to a file, kill it anyway? (y or n)

slightly shorter:

• Buffer not associated with a file; kill anyway? (y or n)
• Buffer not saved to a file; kill anyway? (y or n)

The shorter messages would be similar to the current message that appears when one tries to delete a buffer containing a modified file:

Buffer filename.txt modified; kill anyway? (y or n)

System Info :computer:

• OS: windows-nt
• Emacs: 25.1.1
• Spacemacs: 0.200.3
• Spacemacs branch: develop (rev. b550945)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

(auto-completion autohotkey emacs-lisp git helm)

• System configuration features: XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS

[fiveNinePlusR]

There is a problem with this because emacs uses a lot of one-off special buffers. I would love to have this as a feature though but only for the buffers I create manually. (e.g. not a magit or helm buffer.)

[github-actions[bot]]

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