SIGSEGV on master regarding math completion

[Scott Kostyshak]

On Sun, Jan 09, 2022 at 09:49:26PM -0500, Scott Kostyshak wrote:
> To reproduce:
> 
> 1. Start a new document.
> 2. Ctrl + m to start math inset.
> 3. Type \phantomx<Space>. Note that \phantomx is not a command so don't
>    expect it to be recognized.
> 4. Press <Left>, <Backspace>, <Backspace> to delete the "x" and the "m".
> 5. Type "m" to finish "phantom".
> 6. Wait for the completion pop-down to appear (this takes a second).
> 7. Press <Tab>.
> 
> I tried to find a more simple recipe to reproduce but could not.
> 
> The result is that I get a SIGSEGV. Backtrace is attached.

Can anyone reproduce?

I cannot reproduce on 2.3.0, but the 2.3.0 behavior is not ideal either.
After (7) there's no crash but also the phantom inset is not created.
That said, if it would be helpful for me to spend time on a bisect I
don't mind.

Scott
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