typing: Gtk4: Return correct type for Gtk.Template

src/gi-stubs/repository/_Gtk4.pyi

@@ -20,6 +20,7 @@ from gi.repository import Gsk
 from gi.repository import Pango
 
 _SomeSurface = TypeVar("_SomeSurface", bound=cairo.Surface)
+T = TypeVar("T")
 
 # override
 CellRendererT = TypeVar(
@@ -29147,7 +29148,7 @@ class Template:
     def from_resource(cls, resource_path: str) -> Template: ...
     @classmethod
     def from_string(cls, string: str) -> Template: ...
-    def __call__(self, cls) -> Template: ...
+    def __call__(self, cls: T) -> T: ...
 
     class Callback:
         def __init__(self, name: str = ...) -> None: ...

tools/generate.py

@@ -336,7 +336,7 @@ def _build(parent: ObjectT, namespace: str, overrides: dict[str, str]) -> str:
     ns = set()
     ret = _gi_build_stub(parent, namespace, dir(parent), ns, overrides, None, "")
 
-    typevars: list[str] = []
+    typevars: list[str] = ['T = typing.TypeVar("T")']
     imports: list[str] = []
     if "cairo" in ns:
         imports = ["import cairo"]