> I don't think it's memory corruption. I suspect the problem is
> related to the different ways cmgoto chooses to get to the specified
> screen coordinates. If someone on the affected systems could tweak
> cmgoto such that only the direct move is used, i.e. this code:
>
> p = (dcm == tty->Wcm->cm_habs
> ? tgoto (dcm, row, col)
> : tgoto (dcm, col, row));
> emacs_tputs (tty, p, 1, cmputc);
> curY (tty) = row, curX (tty) = col;
>
> then perhaps we could see if my suspicions are in the right direction.
Hi Eli,
I just applied this patch trying to solve a different but related issue (https://www.virtualbox.org/ticket/13687).
I am happy to report that applying this patch completely solved the redrawing issues I was experiencing!
One option for you to recreate this issue locally seems to be to install virtual box, config a virtual machine with multiple cores, ssh into it and rung emacs.
I've put my diff here (https://github.com/martintrojer/emacs/commit/bdff1ff98d02f4307659c052d0b35a40a36f0706), and I understand it can't be merged as-is hopefully this can help you find a solution that go into mainline emacs.