Fix/code class pygments short hex #2355

fix_code_class_pygments_hex.patch

@@ -0,0 +1,28 @@
+diff --git a/tests/test_code_class.py b/tests/test_code_class.py
+new file mode 100644
+index 00000000..f310e667
+--- /dev/null
++++ b/tests/test_code_class.py
+@@ -0,0 +1,22 @@
++import re
++import pytest
++
++
++def expand_hex(markup):
++    return re.sub(
++        r'(?<=["\'])#([0-9a-fA-F]{3})(?=["\'])',
++        lambda m: '#' + ''.join(c * 2 for c in m.group(1)),
++        markup
++    )
++
++
++def test_expand_3digit_hex():
++    assert expand_hex('foreground="#abc"') == 'foreground="#aabbcc"'
++    assert expand_hex('foreground="#fff"') == 'foreground="#ffffff"'
++    assert expand_hex('foreground="#aabbcc"') == 'foreground="#aabbcc"'
++
++
++def test_expand_multiple_colors():
++    markup = 'color="#abc" background="#def"'
++    result = expand_hex(markup)
++    assert result == 'color="#aabbcc" background="#ddeeff"'

manimlib/mobject/svg/text_mobject.py

@@ -454,6 +454,12 @@ def __init__(
             style=code_style
         )
         markup = pygments.highlight(code, lexer, formatter)
+        # Pango does not support 3-digit hex colors generated by pygments >= 2.14
+        markup = re.sub(
+            r'(?<=["\'])#([0-9a-fA-F]{3})(?=["\'])',
+            lambda m: '#' + ''.join(c * 2 for c in m.group(1)),
+            markup
+        )
         markup = re.sub(r"</?tt>", "", markup)
         super().__init__(
             markup,

test_code_fix.py

@@ -0,0 +1,8 @@
+from manimlib import *
+
+
+class TestCodeFix(Scene):
+    def construct(self):
+        c = Code('sorted(iterable, key=None, reverse=False)')
+        self.play(FadeIn(c))
+        self.wait()

tests/test_code_class.py

@@ -0,0 +1,22 @@
+import re
+import pytest
+
+
+def expand_hex(markup):
+    return re.sub(
+        r'(?<=["\'])#([0-9a-fA-F]{3})(?=["\'])',
+        lambda m: '#' + ''.join(c * 2 for c in m.group(1)),
+        markup
+    )
+
+
+def test_expand_3digit_hex():
+    assert expand_hex('foreground="#abc"') == 'foreground="#aabbcc"'
+    assert expand_hex('foreground="#fff"') == 'foreground="#ffffff"'
+    assert expand_hex('foreground="#aabbcc"') == 'foreground="#aabbcc"'
+
+
+def test_expand_multiple_colors():
+    markup = 'color="#abc" background="#def"'
+    result = expand_hex(markup)
+    assert result == 'color="#aabbcc" background="#ddeeff"'