Sets the background color for text which is highlighted. If NULL, highlighted text (which is usually highlighted because it is selected) will be drawn with foreground and background colors reversed.
the new color to use for highlighted text, or NULL. [allow-none] Since 0.11.11
See Implementation
Sets the background color for text which is highlighted. If NULL, highlighted text (which is usually highlighted because it is selected) will be drawn with foreground and background colors reversed.