A screenshot of emacs showing a "ghost" completion, similar to company-mode's, but builtin.
https://cdn.fosstodon.org/media_attachments/files/114/040/207/026/330/701/original/9eeaf101b8d68f96.png
TIL: There is a builtin completion-preview-mode in recent Emacs.
https://github.com/emacs-mirror/emacs/blob/master/lisp/completion-preview.el
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