> Well, i do remember that Jezze did fix this bug, but only for d3d. Why he did it only
> for d3d, are reasons i dont want to explain here in detail. It was expected that
> someone transfer HLSL to BGFX and so Jezze never touched the BGFX part.
> While excessive HLSL testing, Jezze and me found that bug (that existed even for d3d
> mode) two years ago and we reported that.
> It was said, that Jezze created that bug, by his overhaul changes in MAME 0.160
> (could be 0.161 or 0.162, cant remember it exactly), which of course was not true,
> but he fixed it.
Ah. Thanks for pointing that out. So apparently, I found a 'known issue'. Hurray for me.
Anyway, I did a quick search over on mametesters for all issues reported by uman/Jezze, and a separate search for a few variations of the string 'alt-tab', but did not find this bug. So unless my query's were wrong, currently there is no reported issue for this on mametesters. When/if my account gets approved, I'll report it there.