Horizontal Mask 'bug' (?) in Line2x Optim.320×240

[Galdelico]

Hi there Matt and Marqs. ^_-

Here’s something I stumbled across and that I wanted to bring up to your attention.

Basically, as per the following pictures, I’m using Line2x optim. 320×240 mode on my Japanese Mega Drive 2. The screen is centered, Advanced Timings are all good, Vertical Mask is set to 8 and Horizontal Mask to 0 (zero): I only cranked its brightness up to better demonstrate the issue I’m experiencing.

This is what I get to the right: https://i.imgur.com/e5vcUtk.jpg
Alignment is perfect and beyond the last column of visible pixels begins the colored overscan (pink, in this very case).

Now, this is what happens to the left: https://i.imgur.com/v5rUzaq.jpg
As you can see, there’s this hair of Horizontal Mask active by default, literally covering up half-pixel along the vertical border, even if it’s set to 0. If that line wasn’t there, alignment would be perfect to the right as well. No matter what I do with the Advanced Settings, I can’t get rid of it.

I don’t know if that is a bug or if I’m doing anything wrong (I honestly doubt, as for example in Optim. Line4x that doesn’t happen at all, and when it’s set to 0, the H. Mask is actually invisible on both sides), but, in case this can be fixed in a firmware update, I’d absolutely [i]love[/i] to see it patched. As unimportant as it can seem to the majority of OSSC user-base, Optim. 320×240 Line2x is still the best way to display even scanlines on a 1080p screen, so at least to me it would mean massively.

Of course, if there’s already a turnaround, any help would come super appreciated. 😀

Thanks in advance!

— Edit —
What I’m using:
– unmodded Japanese Mega Drive 2 + Mega CD 2
– standard Euro AV RGB scart cable (not a C-sync one, but with sync from composite)
– Asus VG275Q 1080p monitor

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