[wp-trac] [WordPress Trac] #32445: `is_callable()` should be checked in `do_shortcode_tag()`, not `add_shortcode()`

[WordPress Trac]

#32445: `is_callable()` should be checked in `do_shortcode_tag()`, not
`add_shortcode()`
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 Reporter:  wonderboymusic  |      Owner:
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  4.3
Component:  Shortcodes      |    Version:  2.6
 Severity:  normal          |   Keywords:  needs-patch
  Focuses:                  |
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 Actions and filters can be registered before their callbacks actually
 exist. The same should be true for shortcodes. This is a followup of
 #30947 - would be good to be able to add all shortcodes in `default-
 filters.php`

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Ticket URL: <https://core.trac.wordpress.org/ticket/32445>
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