bug#31446: 26.1; sql-interactive-mode buffer naming is broken

[Eli Zaretskii]

> Date: Sat, 02 Jun 2018 19:47:17 -0400
> From: Michael Mauger <mmauger@protonmail.com>
> 
> I have made a commit that fixes the buffer name handling. This code was 
> intended for 26.1 but obviously missed that. Please review it and let me
> know what you find.

Thanks.  Please in the future include in the log message a
ChangeLog-style list of specific changes you made.

> Outstanding work:
> * There is a bug around locating sql-interactive buffers from a sql buffer; I 
>    know how to fix it, just need to further test the code.
> * Rewrite the DOCSTRINGs to reflect the improved logic
> * Add code tests to limit regressions like this in the future
> * Add a Info file documenting sql-mode and the intended behavior.

Great, thanks in advance.