From d9017137e62662840d03c3aaa119d630b621d871 Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Tue, 11 Sep 2018 13:21:14 -0700
Subject: [PATCH] [core] to-color should be idempotent

Ports https://github.com/mapbox/mapbox-gl-js/pull/7260.
---
 src/mbgl/style/expression/coercion.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mbgl/style/expression/coercion.cpp b/src/mbgl/style/expression/coercion.cpp
index 486658dddaf..2481444dc4c 100644
--- a/src/mbgl/style/expression/coercion.cpp
+++ b/src/mbgl/style/expression/coercion.cpp
@@ -30,6 +30,9 @@ EvaluationResult toNumber(const Value& v) {
 
 EvaluationResult toColor(const Value& colorValue) {
     return colorValue.match(
+        [&](const Color& color) -> EvaluationResult {
+            return color;
+        },
         [&](const std::string& colorString) -> EvaluationResult {
             const optional<Color> result = Color::parse(colorString);
             if (result) {