Assembly: Use icon overlay for unconnected joints instead of annoying warning. (#22662)

* Core: FeaturePython : Add getOverlayIcons to python interface

* Assembly: unconnected joints icon overlay Fix #22643

* Update src/Mod/Assembly/Gui/ViewProviderAssembly.cpp

Co-authored-by: Kacper Donat <kadet1090@gmail.com>

* Update AssemblyObject.cpp

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

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

* Update ViewProviderFeaturePython.h

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

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

* Update ViewProviderFeaturePython.h

* Update JointObject.py

* Update ViewProviderFeaturePython.h

* Update ViewProviderFeaturePython.cpp

* Update Application.cpp

* Update ViewProviderFeaturePython.cpp

* Update ViewProviderFeaturePython.h

* Update ViewProviderAssembly.cpp

---------

Co-authored-by: Kacper Donat <kadet1090@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Mod/Assembly/JointObject.py

@@ -573,6 +573,9 @@ class Joint:
         for obj in joint.InList:
             if obj.isDerivedFrom("Assembly::AssemblyObject"):
                 return obj
+            elif obj.isDerivedFrom("Assembly::AssemblyLink"):
+                return self.getAssembly(obj)
+
         return None
 
     def setJointType(self, joint, newType):
@@ -946,6 +949,24 @@ class ViewProviderJoint:
 
         return ":/icons/Assembly_CreateJoint.svg"
 
+    def getOverlayIcons(self):
+        """
+        Return a dictionary of overlay icons.
+        Keys are positions from Gui.IconPosition.
+        Values are the icon resource names.
+        """
+
+        overlays = {}
+
+        assembly = self.app_obj.Proxy.getAssembly(self.app_obj)
+        # Assuming Reference1 corresponds to the first part link
+        if hasattr(self.app_obj, "Reference1"):
+            part = UtilsAssembly.getMovingPart(assembly, self.app_obj.Reference1)
+            if part is not None and not assembly.isPartConnected(part):
+                overlays[Gui.IconPosition.BottomLeft] = "Part_Detached"
+
+        return overlays
+
     def dumps(self):
         """When saving the document this object gets stored using Python's json module.\
                 Since we have some un-serializable parts here -- the Coin stuff -- we must define this method\