support both modules paths

__init__.py

@@ -16,7 +16,7 @@
 
 
 user_scripts_path = Path(bpy.utils.script_path_user())
-pth_path = user_scripts_path / "addons/modules"
+pth_paths = [user_scripts_path / "modules", user_scripts_path / "addons/modules"]
 startup_path = user_scripts_path / "startup"
 
 
@@ -28,7 +28,7 @@ def create_pth_startup_file():  # startup_path, pth_path
     pth_path: the path to add to site packages on startup
     """
     global startup_path
-    global pth_path
+    global pth_paths
     # startup_path = Path(startup_path)
     startup_path.mkdir(parents=True, exist_ok=True)  # startup folder might not exist
     file_path = startup_path / "blender_pth_startup.py"
@@ -39,12 +39,14 @@ def create_pth_startup_file():  # startup_path, pth_path
         with open(file_path, "w") as f:
             text = "# this file was generated by the blender_pip addon\n" \
             "# it enables support for editable pip installs to the modules folder\n" \
-            f"site.addsitedir(r'{pth_path}')\n" \
-            "import site\n"
+            "import site\n" \
+            f"site.addsitedir(r'{pth_paths[0]}')\n" \
+            f"site.addsitedir(r'{pth_paths[1]}')\n" 
             f.write(text)
 
     import site
-    site.addsitedir(pth_path)
+    for pth_path in pth_paths:
+        site.addsitedir(pth_path)
 
 
 class PipQtPreferences(bpy.types.AddonPreferences):
@@ -67,7 +69,7 @@ def execute(self, context):
 
         import pip_qt
 
-        pip_qt.py_pip.default_target_path = pth_path  # todo remove reference of py pip in this module
+        pip_qt.py_pip.default_target_path = pth_paths[0]  # todo remove reference of py pip in this module
         window = pip_qt.show()
 
         return {'FINISHED'}