Fix #307 (#314)

* [test] add test for #307

* [main] user configuration with autload-all should enable color extension
Fixes #307

Author: pkra

lib/main.js

@@ -422,7 +422,7 @@ function ConfigureMathJax() {
       //
       //  Reset the color extension after `autoload-all`
       //
-      if (MathJax.AuthorConfig.extensions.indexOf("TeX/color.js") == -1) {
+      if (MathJax.AuthorConfig.extensions.indexOf("TeX/color.js") == -1 && MathJax.AuthorConfig.extensions.indexOf("TeX/autoload-all.js") == -1) {
               MathJax.Hub.Register.StartupHook("TeX autoload-all Ready",function () {
                 var macros = MathJax.InputJax.TeX.Definitions.macros;
                 macros.color = "Color";

test/userconfig-autoload.js

@@ -0,0 +1,20 @@
+var tape = require('tape');
+var mjAPI = require("../lib/main.js");
+
+tape('User config: autoload-all should enable color extension', function(t) {
+    t.plan(1);
+
+    var tex = '\\definecolor{myorange}{RGB}{255,165,100}\\color{myorange}e^{i \\pi}\\color{Black} = -1';
+    mjAPI.config( {
+        extensions: 'TeX/autoload-all', // a convenience option to add MathJax extensions
+    });
+    mjAPI.start();
+
+    mjAPI.typeset({
+        math: tex,
+        format: "inline-TeX",
+        mml: true
+    }, function(data) {
+        t.ok(!data.errors, 'definecolor should be a known function');
+    });
+});