CAM: Fix bug with loop completion (#22877)

* fixes #22876

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Mod/CAM/PathCommands.py

@@ -85,32 +85,47 @@ class _CommandSelectLoop:
             return False
 
     def Activated(self):
-        from PathScripts.PathUtils import horizontalEdgeLoop
-        from PathScripts.PathUtils import horizontalFaceLoop
+        from PathScripts.PathUtils import horizontalEdgeLoop, horizontalFaceLoop
+
+        if not FreeCADGui.Selection.getSelectionEx():
+            return
 
         sel = FreeCADGui.Selection.getSelectionEx()[0]
+        if not sel.SubObjects:
+            return
+
         obj = sel.Object
-        edge1 = sel.SubObjects[0]
-        if "Face" in sel.SubElementNames[0]:
-            loop = horizontalFaceLoop(sel.Object, sel.SubObjects[0], sel.SubElementNames)
+        sub = sel.SubObjects
+        names = sel.SubElementNames
+        loopwire = None
+
+        # Face selection
+        if "Face" in names[0]:
+            loop = horizontalFaceLoop(obj, sub[0], names)
             if loop:
                 FreeCADGui.Selection.clearSelection()
-                FreeCADGui.Selection.addSelection(sel.Object, loop)
-            loopwire = []
-        elif len(sel.SubObjects) == 1:
-            loopwire = horizontalEdgeLoop(obj, edge1)
-        else:
-            edge2 = sel.SubObjects[1]
-            loopwire = loopdetect(obj, edge1, edge2)
+                FreeCADGui.Selection.addSelection(obj, loop)
+                return
 
-        if loopwire:
-            FreeCADGui.Selection.clearSelection()
+        # One edge selected
+        elif len(sub) == 1:
+            loopwire = horizontalEdgeLoop(obj, sub[0])
+
+        # Two edges selected
+        elif len(sub) >= 2:
+            loopwire = loopdetect(obj, sub[0], sub[1])
+
+        if hasattr(loopwire, "Edges") and loopwire.Edges:
             elist = obj.Shape.Edges
+            FreeCADGui.Selection.clearSelection()
             for i in loopwire.Edges:
                 for e in elist:
                     if e.hashCode() == i.hashCode():
-                        FreeCADGui.Selection.addSelection(obj, "Edge" + str(elist.index(e) + 1))
-        elif FreeCAD.GuiUp:
+                        FreeCADGui.Selection.addSelection(obj, f"Edge{elist.index(e) + 1}")
+            return
+
+        # Final fallback
+        if FreeCAD.GuiUp:
             QtGui.QMessageBox.information(
                 None,
                 QT_TRANSLATE_NOOP("CAM_SelectLoop", "Feature Completion"),