Fixes #1058::Uma::Calendar drag and drop bug fixed

layouts/v7/skins/vtiger/style.less

@@ -8459,3 +8459,6 @@ input:focus:-ms-input-placeholder { color:transparent; } /* IE 10+ */
 .navbar-fixed-top {
     z-index: 1095 !important;
 }
+body .fc {
+overflow:auto;
+}

modules/Calendar/actions/DragDropAjax.php

@@ -251,7 +251,7 @@ class Calendar_DragDropAjax_Action extends Calendar_SaveAjax_Action {
 					}
 					$result['recurringRecords'] = true;
 				} else {
-					$oldStartDateTime = '';
+                    $oldStartDateTime = array();
 					$oldStartDateTime[] = $record->get('date_start');
 					$oldStartDateTime[] = $record->get('time_start');
 					$oldStartDateTime = implode(' ', $oldStartDateTime);
@@ -260,7 +260,7 @@ class Calendar_DragDropAjax_Action extends Calendar_SaveAjax_Action {
 					$record->set('date_start',$parts[0]);
 					$record->set('time_start',$parts[1]);
 
-					$oldEndDateTime = '';
+					$oldEndDateTime = array();
 					$oldEndDateTime[] = $record->get('due_date');
 					$oldEndDateTime[] = $record->get('time_end');
 					$oldEndDateTime = implode(' ',$oldEndDateTime);