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cae3c838a7
Problem: :edit and :enew may reuse a 1-line terminal buffer, causing
the new buffer to still be a terminal buffer.
Solution: Don't reuse a terminal buffer, as it's not reused when it has
more than 1 line.
After this change close_buffer() is the only place where buf_freeall()
can be called on a terminal buffer, so move the buf_close_terminal()
call into buf_freeall() to save some code. Furthermore, closing the
terminal in buf_freeall() is probably more correct anyway, as it is
"things allocated for a buffer that are related to the file".
Also, remove the useless check for on_detach callbacks deleting buffer.
Even if b_locked fails to prevent that, the crash will happen at the end
of buf_updates_unload() first. On the other hand, many other call sites
of buf_updates_unload() and other buffer_updates_* functions don't set
b_locked, which may be a problem as well...
(cherry picked from commit 23aa4853b3)