views_plugin_display_block::get_argument_input in modules/views/plugins/views_plugin_display_block.inc

Adjust the array of argument input to match the current list of arguments available for this display. This ensures that changing the arguments doesn't cause the argument input field to just break.

views_plugin_display::get_field_labels in modules/views/plugins/views_plugin_display.inc

Retrieve a list of fields for the current display with the relationship associated if it exists.

views_plugin_display::get_handler in modules/views/plugins/views_plugin_display.inc

Get the handler object for a single handler.

views_plugin_display::is_identifier_unique in modules/views/plugins/views_plugin_display.inc

Check if the provided identifier is unique.

views_plugin_display::options_form in modules/views/plugins/views_plugin_display.inc

Provide the default form for setting options.

views_plugin_display::render_area in modules/views/plugins/views_plugin_display.inc

views_plugin_display::validate in modules/views/plugins/views_plugin_display.inc

Make sure the display and all associated handlers are valid.