Allow ruby text to inherit its color from parent text.

Fixes #5418

renpy/text/text.py

@@ -239,8 +239,8 @@ class TextSegment(object):
             self.underline = 0
 
         self.strikethrough = layout.scale_int(style.strikethrough)
-        self.color = style.color
-        self.black_color = style.black_color
+        self.color = style.color or self.color
+        self.black_color = style.black_color or self.black_color
         self.hyperlink = None
         self.kerning = layout.scale(style.kerning)
         self.outline_color = None

sphinx/source/changelog.rst

@@ -40,6 +40,9 @@ purposes.
 Features
 --------
 
+:ref:`Ruby/Furigana text <ruby-text>` can now inherit its color from the parent text,
+by setting :propref:`color` to None.
+
 Transform now supports the :tpref:`fps` property, which quantizes time inside
 the transform to a particular number of frames per second.
 

sphinx/source/style_properties.rst

@@ -478,6 +478,9 @@ Text Style Properties
     When rendering an image-based font, black will be mapped to this
     color. This has no effect for TrueType fonts.
 
+    This may be None in the case of ruby/furigana text, to use the same
+    color as the parent text.
+
 .. style-property:: bold boolean
 
     If True, render the font in a bold style. For a TrueType font,
@@ -497,6 +500,9 @@ Text Style Properties
     the font is rendered in this color. When using an image-based
     font, white is mapped to this color.
 
+    This may be None in the case of ruby/furigana text, to use the same
+    color as the parent text.
+
 .. style-property:: emoji_font string
 
     The font that's used to render Emoji characters. This is automatically

sphinx/source/text.rst

@@ -619,6 +619,7 @@ For example::
     style ruby_style is default:
         size 12
         yoffset -20
+        color None # Use the same color as the parent text.
 
     style say_dialogue:
         ruby_line_leading 12