Panels Pane region restriction

Restrict panel panes availability per layout/region based on tags.

Usage example

Layout plugin definition

$plugin = array(
  'title' => t('Custom Landing Page'),
  'category' => t('Custom layouts'),
  'icon' => 'landing_page.png',
  'theme' => 'custom_landing_page',
  'regions' => array(
    'top' => t('Top'),
    'menu_bar' => t('Menu bar'),
    'main' => t('Main'),
    'sidebar_left' => t('Sidebar left'),
    'sidebar_right' => t('Sidebar right'),
  ),
  'tags' => array(
    'top' => array(),
    'menu_bar' => array(),
    'main' => array('full_width'),
    'sidebar_left' => array('one_column', 'embed_code'),
    'sidebar_right' => array('one_column'),
  ),
);

Custom pane - ctools plugin of "content_types" type

$plugin = array(
  'single' => TRUE,
  'title' => t('Full-width pane'),
  'description' => t('Provides full-width pane'),
  'category' => 'Custom category',
  'edit form' => 'full_width_pane_edit_form',
  'render callback' => 'full_width_pane_render',
  'tags' => array('full_width'),
);

This "Full-width pane" will be available only for the "Main" region of the "Custom Landing Page" layout.