Improve webbrowser stubs (#7190)

- `BaseBrowser.open` is an abstract method that should be overridden in all subclasses.
- `UnixBrowser.open` only accepts 0, 1 or 2 for the `new` parameter.

stdlib/webbrowser.pyi

@@ -1,5 +1,7 @@
 import sys
+from abc import abstractmethod
 from typing import Callable, Sequence
+from typing_extensions import Literal
 
 class Error(Exception): ...
 
@@ -23,16 +25,19 @@ class BaseBrowser:
     name: str
     basename: str
     def __init__(self, name: str = ...) -> None: ...
+    @abstractmethod
     def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
     def open_new(self, url: str) -> bool: ...
     def open_new_tab(self, url: str) -> bool: ...
 
 class GenericBrowser(BaseBrowser):
     def __init__(self, name: str | Sequence[str]) -> None: ...
+    def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
 
 class BackgroundBrowser(GenericBrowser): ...
 
 class UnixBrowser(BaseBrowser):
+    def open(self, url: str, new: Literal[0, 1, 2] = ..., autoraise: bool = ...) -> bool: ...  # type: ignore[override]
     raise_opts: list[str] | None
     background: bool
     redirect_stdout: bool
@@ -49,12 +54,20 @@ class Galeon(UnixBrowser):
 class Chrome(UnixBrowser): ...
 class Opera(UnixBrowser): ...
 class Elinks(UnixBrowser): ...
-class Konqueror(BaseBrowser): ...
-class Grail(BaseBrowser): ...
+
+class Konqueror(BaseBrowser):
+    def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
+
+class Grail(BaseBrowser):
+    def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
 
 if sys.platform == "win32":
-    class WindowsDefault(BaseBrowser): ...
+    class WindowsDefault(BaseBrowser):
+        def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
 
 if sys.platform == "darwin":
-    class MacOSX(BaseBrowser): ...
-    class MacOSXOSAScript(BaseBrowser): ...  # In runtime this class does not have `name` and `basename`
+    class MacOSX(BaseBrowser):
+        def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
+
+    class MacOSXOSAScript(BaseBrowser):  # In runtime this class does not have `name` and `basename`
+        def open(self, url: str, new: int = ..., autoraise: bool = ...) -> bool: ...