Require a usable local card before preserving a scoped crop

Author: Deicyde

autoform_cli/assets/blueprint-dag.js

@@ -1289,10 +1289,10 @@
         if (anchor || !data._scopeOverview) center(anchor || nodes[0], readableFloor);
         else {
           var free = freeArea(), start = (free.top || 0) + 12, end = (free.top || 0) + free.band - 12;
-          var usable = nodes.some(function (node) { var box = screen(node);
+          var usable = nodes.some(function (node) { if (node.kind === "boundary") return false; var box = screen(node);
             return box.x >= free.left + 12 && box.x + box.w <= free.right - 12 && box.y >= start && box.y + box.h <= end;
           });
-          // Keep useful padded coverage; a first external boundary is not an
+          // Keep useful local coverage; a first external boundary is not an
           // instruction to push the mathematical overview off the viewport.
           if (!usable) center(nodes.find(function (node) { return node._overviewGroup; }) ||
             nodes.find(function (node) { return node.kind !== "boundary"; }) || nodes[0], readableFloor);

autoform_cli/assets/blueprint-explorer.min.js

@@ -183,3 +183,14 @@ def test_scoped_crop_without_any_usable_card_falls_back_to_a_local_group_not_bou
       const box=screen(data.nodes[1]);assert(Math.abs(box.x+box.w/2-dom$stage.clientWidth/2)<1e-8);
       assert(!usable(data.nodes[0]),'The first boundary must not displace the fallback group');
     """)
+
+
+def test_scoped_crop_with_only_a_usable_boundary_still_frames_a_local_group() -> None:
+    _run(_SCOPED_CROP + r"""
+      dom$stage={clientWidth:390,clientHeight:560};data.nodes=data.nodes.slice(0,2);ui$active=data.nodes;
+      const boxes=new Map([[data.nodes[0].id,{x:0,y:0,w:196,h:100}],
+        [data.nodes[1].id,{x:1000,y:1000,w:264,h:148}]]);
+      world=node=>boxes.get(node.id);fit();assert(ui$readableCrop);
+      assert(usable(data.nodes[1]),'A fully contained external boundary is not a usable local overview');
+      const box=screen(data.nodes[1]);assert(Math.abs(box.x+box.w/2-dom$stage.clientWidth/2)<1e-8);
+    """)