Fix: Khal event lasting multiple days

Multiple days events are now displayed only once. This fix is also
compatible with a previous fix, which was meant to deal with recurring
events.

fix #1908

Scripts/python/src/calendar/khal-events.py

@@ -55,6 +55,7 @@ def main():
         '--json', 'calendar',
         '--json', 'description',
         '--json', 'location',
+        '--json', 'repeat-pattern',
         khal_start,
         duration
     ]

Services/Location/Calendar/Khal.qml

@@ -131,13 +131,16 @@ Singleton {
 
   function parseEvents(text) {
     const result = [];
+    const duplicates = new Set();
 
     for (const line of text.split("\n")) {
       if (!line.trim())
         continue;
       const dayEvents = JSON.parse(line);
       for (const event of dayEvents) {
-        result.push({
+        if (event["repeat-pattern"] !== "") {
+          // if there is a repeat pattern, the event must be included each time
+          result.push({
                       uid: event.uid,
                       calendar: event.calendar,
                       summary: event.title,
@@ -145,7 +148,21 @@ Singleton {
                       end: parseTimestamp(event["end-long-full"]),
                       location: event.location,
                       description: event.description
-                    });
+                      });
+          }
+        else if (!duplicates.has(event.uid) ) {
+          // in any other cases, we must remove duplicates using the uid of the event
+          result.push({
+                      uid: event.uid,
+                      calendar: event.calendar,
+                      summary: event.title,
+                      start: parseTimestamp(event["start-long-full"]),
+                      end: parseTimestamp(event["end-long-full"]),
+                      location: event.location,
+                      description: event.description
+                      });
+          duplicates.add(event.uid)
+        } 
       }
     }