[wp-trac] [WordPress Trac] #39231: Allow the pdf fallback_intermediate_image_sizes filter to process add_image_size() sizes.

[WordPress Trac]

#39231: Allow the pdf fallback_intermediate_image_sizes filter to process
add_image_size() sizes.
--------------------------+-----------------------------
 Reporter:  gitlost       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:  4.7
 Severity:  normal        |   Keywords:
  Focuses:                |
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 The `fallback_intermediate_image_sizes` filter added in #38594 only works
 for default `get_option` sizes and not user-defined `add_image_size()`
 sizes, unlike the `intermediate_image_sizes_advanced` filter. It'd be more
 useful if it could work with user-defined sizes also. My particular use
 case is adding a plugin-defined list thumbnail size, smaller than the
 default thumbnail size.

 The following patch just copies the (before) logic used for
 `intermediate_image_sizes_advanced` to the (after) logic of
 `fallback_intermediate_image_sizes`. It includes a unittest.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39231>
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