Trying to use baseline alignment in JavaFX can be pretty hard to get right. For example: put some shape and a label into a layout container, and the container's baseline might not reflect what you would intuitively assume (which is the text baseline). In fact, most layout containers just take the first child that reports a baseline other than the special constant BASELINE_OFFSET_SAME_AS_HEIGHT and use that as the baseline for the entire container.
Since there is no meaningful baseline if the first child is not a text node, the layout container won't neatly align with other kinds of text or text composites. Another issue is that the baseline offset of a resizable node depends on the height of the node, but the height of the node also depends on the baseline offset. This circular dependency is currently unaccounted for in controls such as Labeled (that's the reason for bugs like JDK-809261). I've prepared a PR that makes working with baseline alignments easier and more consistent, and also solves the circular dependency problem by introducing a multi-pass layout algorithm. The PR includes before-and-after images that help visualize the problem and the proposed solution. Here's the PR: https://github.com/openjdk/jfx/pull/433
