Adjust code to Andrew Coffeey's reviews.

Author: narilee2006

buildconfig/stubs/pygame/font.pyi

@@ -58,6 +58,8 @@ class Font:
     def point_size(self, value: int) -> None: ...
     @property
     def outline(self) -> int: ...
+    @outline.setter
+    def outline(self, value: int) -> None: ...
     def __init__(self, filename: Optional[FileArg] = None, size: int = 20) -> None: ...
     def render(
         self,

src_c/font.c

@@ -842,6 +842,8 @@ font_setter_outline(PyObject *self, PyObject *value, void *closure)
     DEL_ATTR_NOT_SUPPORTED_CHECK("outline", value);
 
     val = PyLong_AsLong(value);
+    if ((val == -1) && (PyErr_Occurred() != NULL))
+        return -1;
 
     TTF_SetFontOutline(font, val);
     return 0;

test/font_test.py

@@ -981,6 +981,7 @@ def test_font_property_should_raise_exception_after_quit(self):
                 ("italic", True),
                 ("underline", True),
                 ("strikethrough", True),
+                ("outline", 2006),
             ]
             skip_properties = set()
             version = pygame.font.get_sdl_ttf_version()
@@ -992,10 +993,6 @@ def test_font_property_should_raise_exception_after_quit(self):
                 properties.append(("point_size", 1))
             else:
                 skip_properties.add("point_size")
-            if version >= (2, 0, 12):
-                properties.append(("outline", 2006))
-            else:
-                skip_properties.add("outline")
 
         font = pygame_font.Font(None, 10)
         actual_names = []