[wp-trac] [WordPress Trac] #38777: Add method to merge one WP_Error into another

[WordPress Trac]

#38777: Add method to merge one WP_Error into another
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 Reporter:  rmccue                    |       Owner:  dlh
     Type:  feature request           |      Status:  assigned
 Priority:  normal                    |   Milestone:  5.6
Component:  General                   |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  rest-api
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Comment (by TimothyBlynJacobs):

 I think the worry about not reading from the old property is if people
 write to `error_data` directly. If we do the extra work of shifting
 messages, `get_all_error_data()` should, I think, return the correct
 values. Whereas if we don't do the message shifting, a direct write to
 `error_data` would be lost.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38777#comment:23>
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