Minor changes/fixes (#301)

* Update ical.js.gs

according #259

* Update Helpers.gs

as in 271 and discord

* Update Helpers.gs

increased max. number of results returned by CalendarList.list() to prevent creation of new target calendars in case of high amount of calendars.

* Update Helpers.gs

Author: jonas0b1011001

Helpers.gs

@@ -107,7 +107,7 @@ function fetchSourceCalendars(sourceCalendarURLs){
  * @return {Calendar} The calendar retrieved or created
  */
 function setupTargetCalendar(targetCalendarName){
-  var targetCalendar = Calendar.CalendarList.list({showHidden: true}).items.filter(function(cal) {
+  var targetCalendar = Calendar.CalendarList.list({showHidden: true, maxResults: 250}).items.filter(function(cal) {
     return ((cal.summaryOverride || cal.summary) == targetCalendarName) &&
                 (cal.accessRole == "owner" || cal.accessRole == "writer");
   })[0];
@@ -172,6 +172,15 @@ function parseResponses(responses){
       }
     });
   }
+ 
+  //No need to process calcelled events as they will be added to gcal's trash anyway
+  result = result.filter(function(event){
+    try{
+      return (event.getFirstPropertyValue('status').toString().toLowerCase() != "cancelled");
+    }catch(e){
+      return true;
+    }
+  });
 
   result.forEach(function(event){
     if (!event.hasProperty('uid')){
@@ -187,7 +196,7 @@ function parseResponses(responses){
       icsEventsIds.push(event.getFirstPropertyValue('uid').toString());
     }
   });
- 
+  
   return result;
 }
 
@@ -511,6 +520,14 @@ function checkSkipEvent(event, icalEvent){
           rrule.setValue(recur);
         }
 
+        var exDates = event.getAllProperties('exdate');
+        exDates.forEach(function(e){
+          var ex = new ICAL.Time.fromString(e.getFirstValue().toString());
+          if (ex < newStartDate){
+            event.removeProperty(e);
+          }
+        });
+        
         var rdates = event.getAllProperties('rdate');
         rdates.forEach(function(r){
           var vals = r.getValues();

ical.js.gs

@@ -89,7 +89,9 @@ ICAL.helpers = {
       if (
         reqTzid.hasOwnProperty(i) &&
         !vtimezones[i] &&
-        ICAL.TimezoneService.has(i)
+        ICAL.TimezoneService.has(i) &&            
+        ICAL.TimezoneService.get(i).component
+        
       ) {
         vcal.addSubcomponent(ICAL.TimezoneService.get(i).component);
       }
@@ -1320,7 +1322,7 @@ ICAL.design = (function() {
     /**
      * Can be set to false to make the parser more lenient.
      */
-    strict: true,
+    strict: false,
 
     /**
      * The default set for new properties and components if none is specified.