🚀 go-pugleaf

I have

  (setq completion-ignore-case t)

in my .emacs file.  Unfortunately, this causes the following bug:

Assume there is a buffer called 'TAGS', but no other buffer starting
with 'tag' (either upper or lower case).  If I type

  C-x b tag [TAB]			 (note that 'tag' is singular)

the message in the Echo Area is

  Switch to buffer: (default foo) TAGS

and if I then press [ENTER], Emacs will select the TAGS buffer.  Note
that when I typed [TAB] to complete 'tag', the buffer name was
converted to upper case.  On the other hand, if I type

  C-x b tags [TAB]			  (note that 'tags' is plural)

the message in the Echo Area is

  Switch to buffer: (default foo) tags [Sole completion]

and if I then press [ENTER], Emacs will not select the TAGS buffer,
but instead will make a new buffer called 'tags'.  This is wrong,
because Emacs explicitly told me that 'tags' was the '[Sole completion]'.
To be consistent in this case, Emacs should convert 'tags' to 'TAGS'
when I hit [TAB].

Of course, if a 'tags' buffer already exists, it makes perfect sense
not to convert its name to uppercase.  However, since in this case
Emacs tells you 'tags [Sole completion]', it should convert to
uppercase, since that is in fact the completion.

Happy hacking!