Have you tested it with non-square tiles?

Have you tested it with non-square tiles?

Yep, looks good:

Yep, looks good:

I could have been more precise, I meant non-square tile shape. Or more specifically all different combinations of tile shape/layout/offset_axis settings:

32x16 isometric

16x5 isometric

5x5 hexagon

Layout/offset axis do not change the outcome.

In these cases, the positioning is closer to the intended than with 4.0 stable. Whether or not the exact pixel positioning is correct or not is probably another issue, as it is enforced by draw_tile taking an integer tile position.

16x5 isometric

This shows it doesn't work properly: the tile on the right has incorrect position, it should be 0.5 unit upwards (X axis should go through its middle).

5x5 hexagon

This shows it doesn't work properly: for these 3 rows of tiles the middle row should be exactly in between the two other rows rows (both overlaps should be 1.5 unit in height).

MRP from #62911 (comment) with this PR:

As you can see the the in-editor grid is drawn properly as it's aligned with the (0, 0) cell (the green one) which is properly aligned with the X/Y axes. It's the tiles with odd Y coordinate being rendered incorrectly (like the white one).

BTW what I've suggested in #62911 (comment) has the exact same issue.

That's because the tilemap composes all the tiles in the quadrant using integer coordinates. Perhaps it would be a better change to alter that behaviour.

Hmm, after having a poke around, it seems it would be a major change to place tiles at non-integer coordinates. The quadrants and related placement data are all coded based on integer coordinates.

Hmm, after having a poke around, it seems it would be a major change to place tiles at non-integer coordinates. The quadrants and related placement data are all coded based on integer coordinates.

Indeed, seems like that's the exact cause. Doesn't seem like a major change, it's an actual bug, the local positions shouldn't be truncated to ints in there. I'll open a PR.

Great work, closing.