go to next unsaved buffer

[Dan Jacobson]

Idea: go to next unwritten file (or whatever you call them).

The proposed "go to next unwritten file command", which merely goes
down the buffer list looking for files that are modified but not
written, will come in handy when:

It's 2:42 and the Royal Ball will start in 5 minutes.  Last time this
happened you just hit C-x s y y y y y without actually looking at
what you were saving.  Bad move.

Now with the new proposed command, you don't have to dig those buffers
out of the buffer list, you just run the command, and it's like "next
please".  And yes, if the current buffer is unwritten when the command
is executed, it cycles to the end of the list (bury-buffer) no matter
what... until there are one or none left...

Ah yes, I forgot to dot that i.  Ah yes, I forgot to cross that t.
Yes, no more hurriedly written buffers.  Each one is brought before
your face for final adjustment and approval.

I propose 'em, you implement them.
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