Add custom MailPoet image size for newsletters

lib/Config/Hooks.php

@@ -38,5 +38,19 @@ class Hooks {
       '\MailPoet\Segments\WP::synchronizeUser',
       1
     );
+
+    add_filter(
+      'image_size_names_choose',
+      array(
+        $this,
+        'appendImageSizes'
+      )
+    );
+  }
+
+  function appendImageSizes($sizes) {
+    return array_merge($sizes, array(
+      'mailpoet_newsletter_max' => __('MailPoet Newsletter'),
+    ));
   }
 }

lib/Config/Initializer.php

@@ -29,6 +29,7 @@ class Initializer {
     $this->setupPublicAPI();
     $this->runQueueSupervisor();
     $this->setupHooks();
+    $this->setupImages();
   }
 
   function setupDB() {
@@ -140,4 +141,8 @@ class Initializer {
       $supervisor->checkDaemon();
     } catch (\Exception $e) {}
   }
+
+  function setupImages() {
+    add_image_size('mailpoet_newsletter_max', 1320);
+  }
 }