Accept unknown values in Scancode and KeySym enums.

Fixes a crash with the event handling.

Author: HexDecimal

CHANGELOG.rst

@@ -8,6 +8,8 @@ v2.0.0
 
 Unreleased
 ------------------
+Fixed
+ - *Scancode* and *KeySym* enums no longer crash when SDL returns an unexpected value.
 
 12.7.1 - 2021-06-30
 -------------------

tcod/event.py

@@ -1598,6 +1598,14 @@ def scancode(self) -> "Scancode":
         """
         return self
 
+    @classmethod
+    def _missing_(cls, value: object) -> "Optional[Scancode]":
+        if not isinstance(value, int):
+            return None
+        result = cls(0)
+        result._value_ = value
+        return result
+
     def __eq__(self, other: Any) -> bool:
         if isinstance(other, KeySym):
             raise TypeError(
@@ -2137,6 +2145,14 @@ def scancode(self) -> Scancode:
         _init_sdl_video()
         return Scancode(lib.SDL_GetScancodeFromKey(self.value))
 
+    @classmethod
+    def _missing_(cls, value: object) -> "Optional[KeySym]":
+        if not isinstance(value, int):
+            return None
+        result = cls(0)
+        result._value_ = value
+        return result
+
     def __eq__(self, other: Any) -> bool:
         if isinstance(other, Scancode):
             raise TypeError(