Fix escape characters in strings inside templates inside templated strings ${"\n"}

Author: gfwilliams

ChangeLog

@@ -25,6 +25,7 @@
             Puck.js: E.getTemperature(true) will now use the uC's internal temp sensor (previously only external was possible)
             Add fast path to xIntArray.indexOf
             Add median-of-3 for Array.sort (1/3 of the compares for pre-sorted data)
+            Fix escape characters in strings inside templates inside templated strings `${"\n"}`
 
      2v27 : nRF5x: Ensure Bluetooth notifications work correctly when two separate connections use the same handle for their characteristics
             nRF5x: Remove handlers from our handlers array when a device is disconnected

src/jslex.c

@@ -352,7 +352,8 @@ static void jslLexString() {
         tempatedStringHasTemplate = true;
       } else if (nesting && lex->currCh=='}') nesting--;
     }
-    if (lex->currCh == '\\') {
+    if (nesting==0 && lex->currCh == '\\') {
+      // only handle escaped characters in the outer template string
       jslGetNextCh();
       char ch = lex->currCh;
       switch (lex->currCh) {