private void CollapseGroupBox(BaseController canvasController, FlowSharpLib.GroupBox gb, IEnumerable <GraphicElement> children)
{
canvasController.Redraw(gb, _ =>
{
gb.SetCollapsedState();
gb.SaveExpandedSize();
canvasController.Elements.Where(el => el.Parent == gb).ForEach(el => el.Visible = false);
Rectangle r = gb.DisplayRectangle;
gb.DisplayRectangle = new Rectangle(r.Location, new Size(r.Width, 30));
// Update connections after display rectangle has been updated, as this adjusts the connection points.
canvasController.UpdateConnections(gb);
});
// In a collapse, the children, being intersecting with the groupbox, will be redrawn.
}
