[LyX/master] Fix #11520 Wrong inpute encoding when master and child use different setting.

[Scott Kostyshak]

On Mon, Mar 18, 2019 at 06:13:40PM +0100, Günter Milde wrote:
> commit 553bebc3550f932ca3c25bbd4ae3905b60026b3c
> Author: Günter Milde <milde at lyx.org>
> Date:   Mon Mar 18 18:16:40 2019 +0100
> 
>     Fix #11520 Wrong inpute encoding when master and child use different setting.
> ---

I get a crash starting with this commit. To reproduce:

  1. Save both of the attached files of this email to the same directory.
  2. In LyX, turn instant preview to "on" in Preferences.
  3. Open mwe.lyx.

LyX gives a SIGSEGV on opening the file.

Attached is a patch. I don't know if it makes sense. It attempts to keep
the desired behavior of 553bebc3 except when oldEnc is 0. Günter can you
have a look?

Scott
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