make indexsetting visually distinct from stringsetting

src/main/java/me/kawaiizenbo/moonlight/module/settings/IndexSetting.java

@@ -1,6 +1,7 @@
 package me.kawaiizenbo.moonlight.module.settings;
 
 import me.kawaiizenbo.moonlight.Moonlight;
+import me.kawaiizenbo.moonlight.util.DrawUtils;
 import net.minecraft.client.font.TextRenderer;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.text.Text;
@@ -25,6 +26,7 @@ public class IndexSetting extends Setting
         drawContext.fill(x+96, y+5, x+190, y+19, Moonlight.THEME.border.getRGB());
         drawContext.fill(x+97, y+6, x+189, y+18, hovered(mouseX, mouseY) ? Moonlight.THEME.hover.getRGB() : Moonlight.THEME.background.getRGB());
         drawContext.drawText(textRenderer, elements[index], x+98, y+8, Moonlight.THEME.text.getRGB(), false);
+        drawContext.drawGuiTexture(DrawUtils.getThemedGUIIcon("updown", Moonlight.THEME.background), x+177, y+6, 12, 12);
     }
 
     @Override

src/main/java/me/kawaiizenbo/moonlight/util/DrawUtils.java

@@ -1,10 +1,18 @@
 package me.kawaiizenbo.moonlight.util;
 
 import me.kawaiizenbo.moonlight.Moonlight;
+import me.kawaiizenbo.moonlight.theme.ThemeColor;
 import net.minecraft.util.Identifier;
 
 public class DrawUtils 
 {
+	public static Identifier getThemedGUIIcon(String textureName, ThemeColor invert)
+	{
+		boolean mode = ((invert.r + invert.g + invert.b) / 3) > 77;
+		String addition = mode ? "_light" : "";
+		return Identifier.of("moonlight", textureName+addition);
+	}
+	
 	public static Identifier getThemedGUIIcon(String textureName)
 	{
 		String addition = Moonlight.THEME.useDarkIcons ? "_light" : "";