[wp-trac] [WordPress Trac] #35102: Responsive images support for external URLs

[WordPress Trac]

#35102: Responsive images support for external URLs
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 Reporter:  polevaultweb             |       Owner:  joemcgill
     Type:  defect (bug)             |      Status:  reviewing
 Priority:  normal                   |   Milestone:  4.4.1
Component:  Media                    |     Version:  4.4
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:
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Comment (by joemcgill):

 After a brief Slack chat with @polevaultweb it seems like this use case is
 something that should be handled by the plugin itself, but after r35821,
 the `wp_calculate_image_srcset` filter is no longer reachable because we
 bail early if the `src` doesn't match one of the available sizes in the
 attachment meta.

 @polevaultweb I wonder if a workaround would be to filter
 `wp_get_attachment_metadata` to insert your offloaded files so
 `wp_image_add_srcset_and_sizes()` can find the corresponding image sizes?

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Ticket URL: <https://core.trac.wordpress.org/ticket/35102#comment:6>
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