Map item placed in item frame experiences Z-fighting

what? I don't get it.
Do you mean the vertical lines that always occur with maps?

No, look at the screenshot, the map in the item frame (in the center of the screenshot) shows horizontal lines which flicker when moving the mouse.
Visible just under certain distances and viewing angles.
Z-fighting occurs when the two planes are on the same Z-axis, here the plane of the map item and the background of the item frame.

Ah, yes, now I see it. I had to open the image in a new tab.
I think it has something to do with anti-aliasing (or not anti-aliasing in this case).
I think your graphics card is the problem. (not sure though)

I can confirm that problem. Running Mac OS X Mountain Lion

Moved it 2/256f forward.

Not fixed in 1.4.3, the texture fighting is still there.
@Mods: How do we reopen a closed issue ? Shall we clone that ?

I can confirm that z-fighting is still there

Jup, still there.

ah yes, now I saw it too.