Add __hash__ to ManimColor (#4051)

* add __hash__ to ManimColor

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update core.py

* add test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix: correct typehint

* fix test

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Benjamin Hackl <[email protected]>

Author: 3 people

Diff for: manim/utils/color/core.py

@@ -1030,6 +1030,9 @@ def __xor__(self, other: Self) -> Self:
             self._internal_from_integer(self.to_integer() ^ int(other), 1.0)
         )
 
+    def __hash__(self) -> int:
+        return hash(self.to_hex(with_alpha=True))
+
 
 RGBA = ManimColor
 """RGBA Color Space"""

Diff for: tests/module/utils/test_color.py

@@ -2,7 +2,7 @@
 
 import numpy as np
 
-from manim import BLACK, Mobject, Scene, VMobject
+from manim import BLACK, RED, WHITE, ManimColor, Mobject, Scene, VMobject
 
 
 def test_import_color():
@@ -49,3 +49,9 @@ def test_set_color():
     assert m.color.to_hex() == "#FFFFFF"
     m.set_color(BLACK)
     assert m.color.to_hex() == "#000000"
+
+
+def test_color_hash():
+    assert hash(WHITE) == hash(ManimColor([1.0, 1.0, 1.0, 1.0]))
+    assert hash(WHITE) == hash("#FFFFFFFF")
+    assert hash(WHITE) != hash(RED)