[wp-trac] [WordPress Trac] #35574: Add default instance information to WP_Widget

[WordPress Trac]

#35574: Add default instance information to WP_Widget
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 Reporter:  westonruter  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Widgets      |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Widgets often have duplicated logic between the `WP_Widget::widget()`,
 `WP_Widget::update()`, and `WP_Widget::form()` methods for checking if a
 given `$instance` property has been set, and if not, supplying a default
 value. In some cases, these `isset` checks are ''not'' performed resulting
 in PHP notices if the methods are programmatically invoked with an empty
 array. I suggest that we introduce a `WP_Widget::$default_instance`
 property or `WP_Widget::get_default_instance()` method that will return
 the `$instance` defaults that can be merged on top of with the current
 `$instance`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35574>
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