Fix yet unsupported "RDATE before DTSTART". This has to be supported.

RDATE is an execption. We do not have control over the point in time
where the exception is scheduled and hence should not assume that is is
always after DTSTART.

Author: rotdrop

lib/Recur/EventIterator.php

@@ -164,7 +164,6 @@ public function __construct($input, ?string $uid = null, ?\DateTimeZone $timeZon
         }
 
         $this->recurIterators = [];
-        $isRecurring = false;
         if (isset($this->masterEvent->RRULE)) {
             foreach ($this->masterEvent->RRULE as $rRule) {
                 $this->recurIterators[] = new RRuleIterator(
@@ -179,12 +178,10 @@ public function __construct($input, ?string $uid = null, ?\DateTimeZone $timeZon
                 $this->recurIterators[] = new RDateIterator(
                     $rDate->getParts(),
                     $this->startDate,
-                    omitStart: $isRecurring
                 );
-                $isRecurring = true;
             }
         }
-        if (!$isRecurring) {
+        if (empty($this->recurIterators)) {
             $this->recurIterators[] = new RRuleIterator(
                 [
                     'FREQ' => 'DAILY',

lib/Recur/RDateIterator.php

@@ -25,13 +25,13 @@ class RDateIterator implements \Iterator
      *
      * @param string|array $rrule
      */
-    public function __construct($rrule, \DateTimeInterface $start, bool $omitStart = false)
+    public function __construct($rrule, \DateTimeInterface $start)
     {
         $this->startDate = $start;
         $this->parseRDate($rrule);
-        if (!$omitStart) {
-            array_unshift($this->dates, \DateTimeImmutable::createFromInterface($this->startDate));
-        }
+        array_unshift($this->dates, \DateTimeImmutable::createFromInterface($this->startDate));
+        sort($this->dates);
+        $this->dates = array_values($this->dates);
         $this->rewind();
     }
 
@@ -142,8 +142,13 @@ protected function parseRDate($rdate)
         if (is_string($rdate)) {
             $rdate = explode(',', $rdate);
         }
-
-        $this->dates = $rdate;
+        $this->dates = array_map(
+            fn(string $dateString) => DateTimeParser::parse(
+                $dateString,
+                $this->startDate->getTimezone()
+            ),
+            $rdate
+        );
     }
 
     /**