Add regression test for issue #1975

Author: davidfstr

test/comment_test.js

@@ -120,4 +120,16 @@ namespace = "comment_";
     cm.execCommand("selectAll")
     cm.execCommand("toggleComment")
   }, "/* foo */\na\n/* bar */\nb", "// /* foo */\n// a\n// /* bar */\n// b")
+  
+  var before = 'console.log("//string gets corrupted.");';
+  var after  = '// console.log("//string gets corrupted.");';
+  test("toggleWithStringContainingComment1", "javascript", function(cm) {
+    cm.setCursor({line: 0, ch: 16 /* after // inside string */});
+    cm.execCommand("toggleComment");
+  }, before, after)
+  test("toggleWithStringContainingComment2", "javascript", function(cm) {
+    cm.setCursor({line: 0, ch: 16 /* after // inside string */});
+    cm.execCommand("toggleComment");
+    cm.execCommand("toggleComment");
+  }, before, before)
 })();