The connection sites a dragged connector end may glue to, drawn over every movable on the
sheet while an end is held (movable-connect surface state); the site the end would take is
filled. Which movables offer sites, and where, is the model's (IMovable.getConnectionSites):
a picture or a chart its four edges, a shape its geometry's, a group none. Drawn by the layer,
not by each content's editor, so a content kind needs nothing of its own to be glued to.
The connection sites a dragged connector end may glue to, drawn over every movable on the sheet while an end is held (
movable-connectsurface state); the site the end would take is filled. Which movables offer sites, and where, is the model's (IMovable.getConnectionSites): a picture or a chart its four edges, a shape its geometry's, a group none. Drawn by the layer, not by each content's editor, so a content kind needs nothing of its own to be glued to.