When using a Column with a repeater and using the column's width to size the items inside the column, the result is item with size (0,0).

When using a common helper property for both Column and delegate width, the problem doesn't occur.

Column {
    id: column
    width: 200

    Repeater {
        model: ...
        Item { width: column.width; ... }
    }
}

If I don't use a repeater and "unfold" the items, the bug does not occur.

This seems to be a regression: It worked fine up until Qt 5.11.3 and is broken in Qt 5.12.0. 

Find a minimal test case attached.