trackbacks: Add checkbox to resend trabckacks even

See https://github.com/s9y/Serendipity/issues/440. Relies on code added to the core during 2.4.0-alpha2

serendipity_event_trackback/ChangeLog

@@ -1,3 +1,7 @@
+1.21:
+-----
+   * Add checkbox to editor area to resend trackbacks
+
 1.20:
 -----
    * Fix draft check.

serendipity_event_trackback/lang_en.inc.php

@@ -14,4 +14,5 @@
 @define('PLUGIN_EVENT_MTRACKBACK_TITLETRACKSEL', 'Only send trackbacks to URLs listed below');
 @define('PLUGIN_EVENT_MTRACKBACK_DELAYED_TRACKBACKS_NAME', 'Delayed Trackbacks');
 @define('PLUGIN_EVENT_MTRACKBACK_DELAYED_TRACKBACKS_DESC', 'Automatically create trackbacks of entries which were not released immediately.');
+@define('PLUGIN_EVENT_MTRACKBACK_TITLERESEND', 'Resend trackbacks');
 

serendipity_event_trackback/serendipity_event_trackback.php

@@ -19,9 +19,9 @@ class serendipity_event_trackback extends serendipity_event
         $propbag->add('description',   PLUGIN_EVENT_MTRACKBACK_TITLEDESC);
         $propbag->add('stackable',     false);
         $propbag->add('author',        'Garvin Hicking, Malte Paskuda, Ian');
-        $propbag->add('version',       '1.20');
+        $propbag->add('version',       '1.21');
         $propbag->add('requirements',  array(
-            'serendipity' => '1.6',
+            'serendipity' => '2.4.0',
             'smarty'      => '2.6.7',
             'php'         => '4.1.0'
         ));
@@ -150,6 +150,11 @@ class serendipity_event_trackback extends serendipity_event
                             }
                         }
                     }
+
+                    if (isset($serendipity['POST']['trackback_resend'])) {
+                        // the user selected to always send trackbacks, even if already stored
+                        $serendipity['skip_trackback_check'] = true;
+                    }
                     break;
 
                 case 'backend_trackback_check':
@@ -193,6 +198,7 @@ class serendipity_event_trackback extends serendipity_event
                         <legend><?php echo PLUGIN_EVENT_MTRACKBACK_TITLETITLE; ?></legend>
                             <input class="input_radio" type="radio" id="checkbox_enable_trackback_1" <?php echo ($serendipity['POST']['enable_trackback'] == 'on'        ? 'checked="checked"' : ''); ?> name="serendipity[enable_trackback]" value="on" /><label for="checkbox_enable_trackback_1"><?php echo ACTIVATE_AUTODISCOVERY; ?></label><br />
                             <input class="input_radio" type="radio" id="checkbox_enable_trackback_2" <?php echo ($serendipity['POST']['enable_trackback'] == 'off'       ? 'checked="checked"' : ''); ?> name="serendipity[enable_trackback]" value="off" /><label for="checkbox_enable_trackback_2"><?php echo PLUGIN_EVENT_MTRACKBACK_TITLETRACKALL; ?></label><br />
+                            <input class="input_checkbox" type="checkbox" id="checkbox_enable_trackback_4" <?php echo ($serendipity['POST']['trackback_resend'] ? 'checked="checked"' : ''); ?> name="serendipity[trackback_resend]" value="true" /><label for="checkbox_enable_trackback_4"><?php echo PLUGIN_EVENT_MTRACKBACK_TITLERESEND; ?></label><br />
                             <input class="input_radio" type="radio" id="checkbox_enable_trackback_3" <?php echo ($serendipity['POST']['enable_trackback'] == 'selective' ? 'checked="checked"' : ''); ?> name="serendipity[enable_trackback]" value="selective" /><label for="checkbox_enable_trackback_3"><?php echo PLUGIN_EVENT_MTRACKBACK_TITLETRACKSEL; ?></label><br />
 
                             <br />