Do not invalidate unnecessary periods.

core/Period.php

@@ -380,16 +380,17 @@ abstract class Period
      * will cascade to week and day periods and year periods will cascade to month, week and day
      * periods.
      *
-     * The method will return periods that are outside the range of this period
-     * and a child period for the start/end date encompasses dates outside the range. For example,
-     * cascading on a month will return the week period for the 1st of the month. The week period
-     * might include days before the 1st. When cascading further, those days will be included in
-     * the result.
+     * The method will not return periods that are outside the range of this period.
      *
      * @return Period[]
      * @ignore
      */
     public function getAllOverlappingChildPeriods()
+    {
+        return $this->getAllOverlappingChildPeriodsInRange($this->getDateStart(), $this->getDateEnd());
+    }
+
+    private function getAllOverlappingChildPeriodsInRange(Date $dateStart, Date $dateEnd)
     {
         $result = array();
 
@@ -398,8 +399,8 @@ abstract class Period
             return $result;
         }
 
-        $childPeriods = Factory::build($childPeriodType, $this->getRangeString());
-        return array_merge($childPeriods->getSubperiods(), $childPeriods->getAllOverlappingChildPeriods());
+        $childPeriods = Factory::build($childPeriodType, $dateStart->toString() . ',' . $dateEnd->toString());
+        return array_merge($childPeriods->getSubperiods(), $childPeriods->getAllOverlappingChildPeriodsInRange($dateStart, $dateEnd));
     }
 
     /**

tests/PHPUnit/Integration/DataAccess/ArchiveInvalidatorTest.php

@@ -346,9 +346,6 @@ class ArchiveInvalidatorTest extends IntegrationTestCase
                 true,
                 array(
                     '2014_12' => array(
-                        '1.2014-12-29.2014-12-29.1.done',
-                        '1.2014-12-30.2014-12-30.1.done',
-                        '1.2014-12-31.2014-12-31.1.done',
                         '1.2014-12-29.2015-01-04.2.done',
                     ),
                     '2015_01' => array(
@@ -389,9 +386,7 @@ class ArchiveInvalidatorTest extends IntegrationTestCase
                         '1.2015-01-26.2015-02-01.2.done',
                         '1.2015-01-01.2015-01-31.3.done',
                     ),
-                    '2015_02' => array(
-                        '1.2015-02-01.2015-02-01.1.done',
-                    ),
+                    '2015_02' => array(),
                     '2015_03' => array(),
                     '2015_04' => array(),
                     '2015_05' => array(),

tests/PHPUnit/Unit/PeriodTest.php

@@ -203,7 +203,6 @@ class PeriodTest extends \PHPUnit_Framework_TestCase
                     array('week', '2015-09-14,2015-09-20'),
                     array('week', '2015-09-21,2015-09-27'),
                     array('week', '2015-09-28,2015-10-04'),
-                    array('day', '2015-08-31,2015-08-31'),
                     array('day', '2015-09-01,2015-09-01'),
                     array('day', '2015-09-02,2015-09-02'),
                     array('day', '2015-09-03,2015-09-03'),
@@ -234,10 +233,6 @@ class PeriodTest extends \PHPUnit_Framework_TestCase
                     array('day', '2015-09-28,2015-09-28'),
                     array('day', '2015-09-29,2015-09-29'),
                     array('day', '2015-09-30,2015-09-30'),
-                    array('day', '2015-10-01,2015-10-01'),
-                    array('day', '2015-10-02,2015-10-02'),
-                    array('day', '2015-10-03,2015-10-03'),
-                    array('day', '2015-10-04,2015-10-04'),
                 ),
             ),