Layout with non even height leads to unecessarily resizing smaller child item's height to non pixel aligned value

Assume a rowlayout of height 37 with a centered child with an implicit height 30.

Expected result:

• height = 30
• y = 4 (with a gap of 3 the other side of the item)
  or possibly even y =3.5

What we get:

• y = 4
• height = 29.5

This is an unexpected height causing rendering bugs, and it's not even achieving a consistent margin.

Minimal test cast attached. Text item at the bottom shows the corrupted item's height.