fix object.Level during nested layout

d2graph/d2graph.go

@@ -57,6 +57,9 @@ type Graph struct {
 	Steps     []*Graph `json:"steps,omitempty"`
 
 	Theme *d2themes.Theme `json:"theme,omitempty"`
+
+	// Object.Level uses the location of a nested graph
+	RootLevel int `json:"rootLevel,omitempty"`
 }
 
 func NewGraph() *Graph {
@@ -529,7 +532,7 @@ func (obj *Object) GetStroke(dashGapSize interface{}) string {
 
 func (obj *Object) Level() ContainerLevel {
 	if obj.Parent == nil {
-		return 0
+		return ContainerLevel(obj.Graph.RootLevel)
 	}
 	return 1 + obj.Parent.Level()
 }

d2graph/layout.go

@@ -41,6 +41,7 @@ func (g *Graph) ExtractAsNestedGraph(obj *Object) *Graph {
 	descendantObjects, edges := pluckObjAndEdges(g, obj)
 
 	tempGraph := NewGraph()
+	tempGraph.RootLevel = int(obj.Level()) - 1
 	tempGraph.Root.ChildrenArray = []*Object{obj}
 	tempGraph.Root.Children[strings.ToLower(obj.ID)] = obj
 

e2etests/regression_test.go

@@ -1037,6 +1037,7 @@ cf many required: {
 		loadFromFile(t, "grid_with_latex"),
 		loadFromFile(t, "icons_on_top"),
 		loadFromFile(t, "dagre_disconnected_edge"),
+		loadFromFile(t, "outside_grid_label_position"),
 	}
 
 	runa(t, tcs)

e2etests/testdata/files/outside_grid_label_position.d2

@@ -0,0 +1,23 @@
+container1: {
+  container2: {
+    container3: {
+      grid-rows: 1
+
+      first: {
+        label.near: outside-top-center
+        child: {
+          label.near: outside-bottom-center
+        }
+      }
+      second: {
+        label.near: outside-top-center
+        child: {
+          label.near: outside-bottom-center
+        }
+      }
+      third: {
+        label.near: outside-top-center
+      }
+    }
+  }
+}