HoloPanels view builder
Offsets are the fiddliest part of a view. This draws them to scale while you change them.
The drawing is the board seen head on, and a panel's up is its bottom edge. Boxes are click regions rather than text extents, which is why two panels can look separated and still fight over a click.
One square is one block; the dot is the board anchor.Boxes are click regions, not text extents.Dashed: provider-fed, so the height depends on what it returns.