invalidate paren-trail if line ends inside a string (close #112)

Author: shaunlebron

lib/parinfer.js

@@ -592,8 +592,20 @@ function appendParenTrail(result) {
   result.parenTrail.endX++;
 }
 
+function invalidateParenTrail(result) {
+  result.parenTrail = {
+    lineNo: SENTINEL_NULL,
+    startX: SENTINEL_NULL,
+    endX: SENTINEL_NULL,
+    openers: []
+  };
+}
+
 function finishNewParenTrail(result) {
-  if (result.mode === INDENT_MODE) {
+  if (result.isInStr) {
+    invalidateParenTrail(result);
+  }
+  else if (result.mode === INDENT_MODE) {
     clampParenTrailToCursor(result);
     popParenTrail(result);
   }