+ // If start date comes after end date chronologically, swap them.
+ // They are swapped in the interface by JS.
+ $start = $opts->getValue( 'start' );
+ $end = $opts->getValue( 'end' );
+ if ( $start !== '' && $end !== '' && $start > $end ) {
+ $temp = $end;
+ $end = $start;
+ $start = $temp;
+
+ $opts->setValue( 'start', $start, true );
+ $opts->setValue( 'end', $end, true );
+
+ // also swap values in request object, which is used by HTMLForm
+ // to pre-populate the fields with the previous input
+ $request = $context->getRequest();
+ $context->setRequest( new DerivativeRequest(
+ $request,
+ [ 'start' => $start, 'end' => $end ] + $request->getValues(),
+ $request->wasPosted()
+ ) );
+ }
+
+ // if all media types have been selected, wipe out the array to prevent
+ // the pointless IN(...) query condition (which would have no effect
+ // because every possible type has been selected)
+ $missingMediaTypes = array_diff( $this->mediaTypes, $opts->getValue( 'mediatype' ) );
+ if ( empty( $missingMediaTypes ) ) {
+ $opts->setValue( 'mediatype', [] );
+ }
+