fix: resolve conflict with markdown-it-katex plugin

Related issue waylonflinn/markdown-it-katex#24

package.json

@@ -45,6 +45,7 @@
     "eslint": "^5.16.0",
     "markdown-it": "^12.0.2",
     "markdown-it-implicit-figures": "^0.9.0",
+    "markdown-it-katex": "^2.0.3",
     "mocha": "^7.1.1",
     "nyc": "^14.1.1"
   },

patterns.js

@@ -313,7 +313,7 @@ module.exports = options => {
             {
               position: -1,
               content: utils.hasDelimiters('end', options),
-              type: (t) => t !== 'code_inline'
+              type: (t) => t !== 'code_inline' && t !== 'math_inline'
             }
           ]
         }

test.js

@@ -3,6 +3,7 @@
 const assert = require('assert');
 const Md = require('markdown-it');
 const implicitFigures = require('markdown-it-implicit-figures');
+const katex = require('markdown-it-katex');
 const attrs = require('./');
 const utils = require('./utils.js');
 
@@ -320,6 +321,13 @@ function describeTestsWithOptions(options, postText) {
       assert.equal(md.render(replaceDelimiters(src, options)), expected);
     });
 
+    it(replaceDelimiters('should work with plugin katex', options), () => {
+      md = md.use(katex);
+      const mdWithOnlyKatex = Md().use(katex);
+      src =  '$\\sqrt{a}$';
+      assert.equal(md.render(src), mdWithOnlyKatex.render(src));
+    });
+
     it(replaceDelimiters('should not apply inside `code{.red}`', options), () => {
       src =  'paragraph `code{.red}`';
       expected = '<p>paragraph <code>code{.red}</code></p>\n';