[wp-trac] [WordPress Trac] #46195: is_block_editor() returns false in the block editor

WordPress Trac noreply at wordpress.org
Wed Apr 17 01:55:28 UTC 2019

#46195: is_block_editor() returns false in the block editor
 Reporter:  Chouby                               |       Owner:  desrosj
     Type:  defect (bug)                         |      Status:  closed
 Priority:  normal                               |   Milestone:  5.1.2
Component:  Editor                               |     Version:  5.0
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-patch needs-testing needs-dev-   |     Focuses:
  note has-unit-tests commit                     |  administration
Changes (by desrosj):

 * status:  assigned => closed
 * resolution:   => fixed


 In [changeset:"45224" 45224]:
 #!CommitTicketReference repository="" revision="45224"
 Administration: Improve the accuracy of `is_block_editor()`.

 Currently, there are a number of scenarios where `is_block_editor()` (and
 `WP_Screen::is_block_editor`) would incorrectly indicate block editor
 support at different points of the loading process. Most notably, checking
 `is_block_editor` when hooking into the `current_screen` action will
 always result in `false`, even when the block editor is being loaded. This
 is because `is_block_editor` is not set to `true` until `edit-form-
 blocks.php` is included.

 This change adds logic to `WP_Screen` to ensure the accuracy of
 `is_block_editor` on block editor pages earlier in the load process.

 While edit screens will now be accurate 100% of the time from
 `current_screen` on, there are still a few edge cases where
 `is_block_editor` could contain an incorrect value when creating a new

 Because a `WP_Post` object is a required parameter for the
 `replace_editor` filter and `use_block_editor_for_post()` function,
 `WP_Screen` will fall back to the value returned by
 `use_block_editor_for_post_type()` for the post being created. To
 eliminate these edge cases, the `use_block_editor_for_post_type` filter
 can be used to return the appropriate boolean value to indicate support.

 Props Chouby, desrosj, aduth, johnbillion.
 Fixes #46195.

Ticket URL: <https://core.trac.wordpress.org/ticket/46195#comment:25>
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