Fix dispatch handling for properties (#2506)

Author: the-snork

CHANGES.txt

@@ -14,6 +14,7 @@ https://mhammond.github.io/pywin32_installers.html .
 Coming in build 311, as yet unreleased
 --------------------------------------
 * Fixed a regression that broke special __dunder__ methods with CoClass. (#1870, #2493, @Avasam, @geppi)
+* Fixed dispatch handling for properties (@the-snork)
 
 Build 310, released 2025/03/16
 ------------------------------

com/win32com/client/__init__.py

@@ -524,11 +524,10 @@ class DispatchBaseClass:
     def __init__(self, oobj=None):
         if oobj is None:
             oobj = pythoncom.new(self.CLSID)
-        elif isinstance(oobj, DispatchBaseClass):
+        elif isinstance(oobj, (DispatchBaseClass, _PyIDispatchType)):
             try:
-                oobj = oobj._oleobj_.QueryInterface(
-                    self.CLSID, pythoncom.IID_IDispatch
-                )  # Must be a valid COM instance
+                oobj = oobj._oleobj_ if isinstance(oobj, DispatchBaseClass) else oobj
+                oobj = oobj.QueryInterface(self.CLSID, pythoncom.IID_IDispatch)
             except pythoncom.com_error as details:
                 import winerror
 
@@ -537,7 +536,7 @@ def __init__(self, oobj=None):
                 # So just let it use the existing object if E_NOINTERFACE
                 if details.hresult != winerror.E_NOINTERFACE:
                     raise
-                oobj = oobj._oleobj_
+
         self.__dict__["_oleobj_"] = oobj  # so we don't call __setattr__
 
     def __dir__(self):