Commit Graph

47 Commits

Author SHA1 Message Date
audrasjb 5bb7ee0fba Grouped backports to the 5.7 branch.
- Media: Prevent CSRF setting attachment thumbnails.
- Embeds: Add protocol validation for WordPress Embed code.
- I18N: Introduce sanitization function for locale.
- Editor: Ensure block comments are of a valid form.

Merges [55760-55764] to the 5.7 branch.
Props dd32, isabel_brison, martinkrcho, matveb, ocean90, paulkevan, peterwilsoncc, timothyblynjacobs, xknown, youknowriad.


Built from https://develop.svn.wordpress.org/branches/5.7@55778


git-svn-id: http://core.svn.wordpress.org/branches/5.7@55290 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-16 15:37:10 +00:00
Sergey Biryukov 5fd4f8e993 Docs: Improve documentation for `WP_Block_Type` properties.
Add a reference to `WP_Block_Type::__construct()` for information on accepted arguments in `register_block_type()`.

Synchronize the documentation between several places, use `WP_Block_Type::__construct()` as the canonical source.

Props ediamin, audrasjb, peterwilsoncc.
Fixes #48640.
Built from https://develop.svn.wordpress.org/trunk@50419


git-svn-id: http://core.svn.wordpress.org/trunk@50030 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-02-23 19:18:02 +00:00
gziolo e8c035f25d Blocks: Add automatic RTL handlind for block styles registered from metadata
Related Gutenberg issue: https://github.com/WordPress/gutenberg/pull/28274

With this change it is going to be possible to use the same pattern that wp_style_add_data uses for RTL handling. If the block style file with "-rtl.css" is included in addition to the regular style referenced in "block.json" file then it is going to be automatically registered.

Props swisspidy, aristath.
See #52301.


Built from https://develop.svn.wordpress.org/trunk@49982


git-svn-id: http://core.svn.wordpress.org/trunk@49683 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-01-19 11:50:08 +00:00
gziolo 2dbcd8933e Blocks: Add i18n support to register_block_type_from_metadata
Related Gutenberg issue: https://github.com/WordPress/gutenberg/issues/23636.
Related WP-CLI PR: https://github.com/wp-cli/i18n-command/pull/210.
Related documentation proposal: https://github.com/WordPress/gutenberg/blob/master/docs/designers-developers/developers/block-api/block-metadata.md#internationalization-not-implemented

Adds programatic i18n support to `register_block_type_from_metadata` function for block settings registered from `block.json` file that provides `textdomain` field.


Props swissspidy, ocean90.
Fixes #52301.


Built from https://develop.svn.wordpress.org/trunk@49981


git-svn-id: http://core.svn.wordpress.org/trunk@49682 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-01-19 11:06:14 +00:00
gziolo a756900974 Editor: Support filtering arguments in block type registration from metadata
Adds 2 new hooks in `register_block_type_from_metadata`:

- Named `block_type_metadata` to filter the content of metadata read from `block.json`
- Named `block_type_metadata_settings` to filter the settings object determined from the metadata that is passed to `register_block_type` call

Props swissspidy.
Fixes #52138.


Built from https://develop.svn.wordpress.org/trunk@49948


git-svn-id: http://core.svn.wordpress.org/trunk@49647 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-01-08 16:45:07 +00:00
John Blackbourn dfe1f9b322 Docs: Promote many `bool` types to `true` or `false` where only that value is used.
See #51800

Built from https://develop.svn.wordpress.org/trunk@49927


git-svn-id: http://core.svn.wordpress.org/trunk@49626 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-01-03 22:04:04 +00:00
gziolo 671d5da0e4 Blocks: Align with Gutenberg the name of generated asset handle for core blocks
Related Gutenberg PR: https://github.com/WordPress/gutenberg/pull/25220.

It aligns with the latest changes added by aristath to the Gutenberg project. As part of styles splitting for core blocks, there was a special pattern introduced for how style handles are named. Ideally, we would apply it to all blocks but there might be some backward compatibility considerations so I left the handling for non-core blocks unchanged.

Props aristath.
See #50328.


Built from https://develop.svn.wordpress.org/trunk@49850


git-svn-id: http://core.svn.wordpress.org/trunk@49569 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-12-21 11:39:08 +00:00
noisysocks 7aa60ecce9 Editor: Remove render_block hooks from WP_Block
Reverts the move of pre_render_block, render_block_data, and
render_block_context to WP_Block.

This change has more implications than first thought so will be revisted later
in 5.7.

Reverts [49609,49608].
See #51612.

Built from https://develop.svn.wordpress.org/trunk@49695


git-svn-id: http://core.svn.wordpress.org/trunk@49418 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-11-25 01:20:09 +00:00
noisysocks 341704d640 Editor: Move pre_render_block, render_block_data, render_block_context
Move the pre_render_block, render_block_data, and render_block_context
filters from render_block() to WP_Block. This ensures that they are
called for all blocks, including nested blocks, not just top-level
blocks.

Fixes #51612.
Props gaambo, gziolo, TimothyBlynJacobs.

Built from https://develop.svn.wordpress.org/trunk@49608


git-svn-id: http://core.svn.wordpress.org/trunk@49346 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-11-16 00:47:11 +00:00
Sergey Biryukov cc7ba27c37 Docs: Correct DocBlock formatting for `render_block()`.
Follow-up to [49310].

See #51606.
Built from https://develop.svn.wordpress.org/trunk@49312


git-svn-id: http://core.svn.wordpress.org/trunk@49074 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-26 21:55:10 +00:00
youknowriad bf5917edf3 Block Editor: Fix WP_Block_Supports class compatibility with Gutenberg-provided class.
When using WordPress trunk with Gutenberg master, there's an incompatibility causing 
the dynamic block generated classes to be omitted.
This commit refactors the block supports to fix that problem.

Props nosolosw.
Fixes #51606.

Built from https://develop.svn.wordpress.org/trunk@49310


git-svn-id: http://core.svn.wordpress.org/trunk@49072 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-26 08:31:11 +00:00
youknowriad d6cff7965a Block Editor: Update the WordPress Packages to the latest version.
This includes the packages that match the Gutenberg 9.2 Release.
It is going to be the last block-editor features update for WordPress 5.6.
It also updates the block-supports code base to the latest APIs.

Props isabel_brison, noisysocks, desrosj.
Fixes #51570.

Built from https://develop.svn.wordpress.org/trunk@49226


git-svn-id: http://core.svn.wordpress.org/trunk@48988 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-20 13:36:16 +00:00
youknowriad 8fbbd54c40 Block Editor: Expose api_version in the block type and the REST endpoint.
The new block editor included in 5.6 introduces an api_version property
that indicates which block API version the block is using. 
This commits makes this property available on the block type and the endpoint.

Props TimothyBlynJacobs, gziolo.
Fixes #51529.


Built from https://develop.svn.wordpress.org/trunk@49224


git-svn-id: http://core.svn.wordpress.org/trunk@48986 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-20 07:54:10 +00:00
John Blackbourn 905460bd5e Docs: Standardise the type name for booleans and integers.
This brings these docs inline with the documentation standards.

Props ravipatel, justinahinon

Fixes #51426

Built from https://develop.svn.wordpress.org/trunk@49120


git-svn-id: http://core.svn.wordpress.org/trunk@48882 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-10 20:02:05 +00:00
Sergey Biryukov d3a3862248 Code Modernization: Fix PHP 8 deprecation notices for optional function parameters declared before required parameters.
As it already was not possible to pass the required parameters without also passing the optional one anyway, removing the default value for the (not so) optional parameters should not affect backward compatibility.

This change affects three functions in core:

* `get_comment_delimited_block_content()`
* `do_enclose()`
* `_wp_delete_tax_menu_item()`

Props jrf, ayeshrajans, desrosj.
Fixes #50343.
Built from https://develop.svn.wordpress.org/trunk@48794


git-svn-id: http://core.svn.wordpress.org/trunk@48556 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-08-15 13:40:03 +00:00
Sergey Biryukov 9f841ea7c3 Docs: Add a note that the `$args` parameter of `register_block_type()` accepts any public property of `WP_Block_Type`.
Follow-up to [47754].

Props ediamin.
See #48640.
Built from https://develop.svn.wordpress.org/trunk@48629


git-svn-id: http://core.svn.wordpress.org/trunk@48391 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-07-26 22:17:01 +00:00
John Blackbourn 1fbcdb2213 Docs: Various corrections to inline docblocks.
See #49572
Built from https://develop.svn.wordpress.org/trunk@48573


git-svn-id: http://core.svn.wordpress.org/trunk@48335 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-07-23 00:48:06 +00:00
gziolo eeb4d75c57 Editor: More strict checks for globals in render_block
Props kraftbj.
Fixes #49927.


Built from https://develop.svn.wordpress.org/trunk@48243


git-svn-id: http://core.svn.wordpress.org/trunk@48012 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-07-01 06:08:06 +00:00
Sergey Biryukov 345549a412 Docs: Correct `$wp_query` global reference in `render_block()`.
See #49927, #49572.
Built from https://develop.svn.wordpress.org/trunk@48226


git-svn-id: http://core.svn.wordpress.org/trunk@47995 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-30 11:16:00 +00:00
gziolo 0249959306 Editor: Introduce block context
Backports a new block context feature from Gutenberg. The purpose of this feature is to be able to establish values in a block hierarchy which can be consumed by blocks anywhere lower in the same hierarchy. These values can be established either by the framework, or by other blocks which provide these values. See documentation: https://github.com/WordPress/gutenberg/blob/master/docs/designers-developers/developers/block-api/block-context.md

Props aduth, epiqueras.
Fixes #49927.


Built from https://develop.svn.wordpress.org/trunk@48224


git-svn-id: http://core.svn.wordpress.org/trunk@47993 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-30 11:04:04 +00:00
Sergey Biryukov 40c389c95e Docs: Standardize on "Returning a value from the filter" vs. "Passing a value to the filter".
The filter is the callback function added with `add_filter()`, therefore the hook passes a value to the filter, and the filter returns a value to change its behaviour.

The documentation is referring to the latter.

Props johnbillion.
See #49572, #16557.
Built from https://develop.svn.wordpress.org/trunk@48185


git-svn-id: http://core.svn.wordpress.org/trunk@47954 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-26 18:49:09 +00:00
gziolo 6cf2f816f0 Editor: Introduce new API method that register block from `block.json` metadata file
Backports changes added to Gutenberg in:
- https://github.com/WordPress/gutenberg/pull/20794
- https://github.com/WordPress/gutenberg/pull/22519
`register_block_type_from_metadata` function is going to be used to register all blocks on the server using `block.json` metadata files.

Props ocean90, azaozz, aduth, mcsf, jorgefilipecosta, spacedmonkey, nosolosw, swissspidy and noahtallen.
Fixes #50263.


Built from https://develop.svn.wordpress.org/trunk@48141


git-svn-id: http://core.svn.wordpress.org/trunk@47910 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-23 15:45:11 +00:00
Sergey Biryukov a576a13246 Docs: Remove an empty line between `@param` and `@return` tags, per the documentation standards.
See #49572.
Built from https://develop.svn.wordpress.org/trunk@48102


git-svn-id: http://core.svn.wordpress.org/trunk@47871 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-20 11:18:09 +00:00
Sergey Biryukov de59ad23a4 Docs: Consistently include an empty line between `@since` tag and `@see`, `@link`, or `@global`, per the documentation standards.
See #49572.
Built from https://develop.svn.wordpress.org/trunk@48067


git-svn-id: http://core.svn.wordpress.org/trunk@47834 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-06-16 21:07:14 +00:00
John Blackbourn 056dad9c2c Docs: Use more specific types in parameter descriptions in place of `mixed`.
See #48303.
Built from https://develop.svn.wordpress.org/trunk@47397


git-svn-id: http://core.svn.wordpress.org/trunk@47184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-03-01 10:38:07 +00:00
whyisjake 317465e2fe Prevent stored XSS in the block editor.
Prevent escaped unicode characters become unescaped in unsafe HTML during JSON decoding.

Props: aduth, epiqueras, 

Built from https://develop.svn.wordpress.org/trunk@46896


git-svn-id: http://core.svn.wordpress.org/trunk@46696 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-12-12 18:02:03 +00:00
John Blackbourn eda6a9e111 Docs: Docs on docs. Further improve documentation of known return types, plus other docs fixes.
See #48303

Built from https://develop.svn.wordpress.org/trunk@46662


git-svn-id: http://core.svn.wordpress.org/trunk@46462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-11-05 21:30:03 +00:00
John Blackbourn e36d1bcbd8 Docs: Docblock corrections and improvements, mostly related to various `pre_*` filters.
See #47110

Built from https://develop.svn.wordpress.org/trunk@46232


git-svn-id: http://core.svn.wordpress.org/trunk@46044 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-09-21 17:41:57 +00:00
jorgefilipecosta b7fbf7d373 Block Editor: Backport block styles server functions from block editor.
This commit backports the block styles functionality added to the block editor in https://github.com/WordPress/gutenberg/pull/16356.

Props: youknowriad, aduth, swissspidy.
Fixes #48039.
Built from https://develop.svn.wordpress.org/trunk@46111


git-svn-id: http://core.svn.wordpress.org/trunk@45923 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-09-14 18:21:54 +00:00
Sergey Biryukov 68fd25ff1a Docs: Remove unused `@global` reference in `do_blocks()` DocBlock.
Props avinapatel.
Fixes #47055.
Built from https://develop.svn.wordpress.org/trunk@45393


git-svn-id: http://core.svn.wordpress.org/trunk@45204 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-05-24 01:05:52 +00:00
desrosj 3d84726ae8 Editor: Correct `since` annotation for the `excerpt_allowed_blocks` filter.
Props mukesh27, rabmalin.
Fixes #47079.
Built from https://develop.svn.wordpress.org/trunk@45284


git-svn-id: http://core.svn.wordpress.org/trunk@45093 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-05-03 16:54:52 +00:00
Andrew Ozz 655c21bbea Fix parsing of inner blocks when auto-generating an excerpt. Helps to prevent cases where dynamic inner blocks may cause an infinite loop if trying to auto-generate an excerpt.
Props desrosj, pento, gziolo, azaozz.
Fixes #46133.
Built from https://develop.svn.wordpress.org/trunk@45265


git-svn-id: http://core.svn.wordpress.org/trunk@45074 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-04-24 21:39:53 +00:00
John Blackbourn 17bdafca77 General: Fix a typo in the docs for `_restore_wpautop_hook()`.
Props manzoorwani.jk

Fixes #46864

Built from https://develop.svn.wordpress.org/trunk@45159


git-svn-id: http://core.svn.wordpress.org/trunk@44968 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-04-11 17:27:52 +00:00
Gary Pendergast affceae936 Blocks: Allow for nested `the_content` calls within `do_blocks()`.
When `do_blocks()` is run, it sets up some special handling of the `wpautop` filter, as we don't want `wpautop` to run on block content, but we do want it to be available for subsequent runs of `the_content`, which may be happening on non-block content.

As we set this up before rendering dynamic blocks, however, a dynamic block choosing to run `the_content` will cause unintentially structural deficiences in this particular recursive block tower.

Moving this handling to after dynamic blocks are rendered makes our tower lean a little less.

Props aldavigdis, pento.
Fixes #45495.


Built from https://develop.svn.wordpress.org/trunk@45139


git-svn-id: http://core.svn.wordpress.org/trunk@44948 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-04-08 06:54:54 +00:00
Gary Pendergast 0bbfe3b8e2 Blocks: Add a `$source_block` parameter to the `render_block_data` filter.
This contains a copy of the block, unmodified by other filter functions, so that plugins have a clean reference to work from, if they need.

Props dmsnell.
Fixes #45451.


Built from https://develop.svn.wordpress.org/trunk@44576


git-svn-id: http://core.svn.wordpress.org/trunk@44407 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-14 01:47:51 +00:00
Gary Pendergast 203d686ec9 Blocks: Reverse the logic when checking the `pre_render_block` result.
We should be returning if the result isn't null, not when it is.

See #45451.


Built from https://develop.svn.wordpress.org/trunk@44555


git-svn-id: http://core.svn.wordpress.org/trunk@44386 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-10 23:31:50 +00:00
Gary Pendergast 8e2f6a9923 Blocks: Add the `pre_render_block` and `render_block_data` filters.
At the start of `render_block()`, the `pre_render_block` filter allows the function to be short-circuited, and the `render_block_data` filter is applied to the `$block` parameter before it's processed.

Props kkarpieszuk, pento.
Fixes #45451.


Built from https://develop.svn.wordpress.org/trunk@44553


git-svn-id: http://core.svn.wordpress.org/trunk@44384 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-10 23:16:50 +00:00
Dominik Schilling 0a66ea8149 Formatting: Remove unused global import for `$wp_filter` in `_restore_wpautop_hook()`.
See #45290.
Built from https://develop.svn.wordpress.org/trunk@44431


git-svn-id: http://core.svn.wordpress.org/trunk@44262 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-07 16:59:52 +00:00
desrosj 4b0f960b7c Block Editor: Fix PHP warning when loading editor styles while in RTL.
In RTL languages, WordPress adds `style-editor-rtl.css` editor styles to the global `$editor_styles`.
This patch ignores handling these styles if the file is not preset.

Also, clarify the docs for the return value of the `block_version` function.

Props mostafa.s1990, desrosj, mukesh27.

Merges [43923] and [43924] to trunk.

Fixes #45288, #45342.
Built from https://develop.svn.wordpress.org/trunk@44270


git-svn-id: http://core.svn.wordpress.org/trunk@44100 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-17 18:07:51 +00:00
desrosj 9d7aa3436e Block Editor: Update `@wordpress` dependencies.
Changes of note:

- Includes the new Annotations API package.
- `wp-polyfill-ecmascript.js` is renamed to `wp-polyfill.js`.
- `strip_dynamic_blocks()` has been removed in favor of `excerpt_remove_blocks()`.
- The PHP block parser is now syncing from the `block-serialization-default-parser` package.
- `do_blocks()` uses the new parser.
- The `do_block` filter has been removed from `do_blocks()`, in favor of a `render_block` filter in `render_block()`.

Also, a little cleanup to `render_block()`. Always normalize `$block['attrs’]` to array in `’render_block’` filter.
Props pento, azaozz.

Merges [43884] and [43888] to trunk.

See #45145, #45190, #45264, #45282.
Built from https://develop.svn.wordpress.org/trunk@44261


git-svn-id: http://core.svn.wordpress.org/trunk@44091 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-17 04:52:00 +00:00
Sergey Biryukov 659ca2bd1e Tests: Fix tests broken in PHP 5.x after [43879].
Props pento.
Merges [43883] to trunk.
See #45290.
Built from https://develop.svn.wordpress.org/trunk@44242


git-svn-id: http://core.svn.wordpress.org/trunk@44072 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-17 03:19:38 +00:00
Jeremy Felt 7509965a56 Formatting: Ensure `wpautop()` isn't run on content generated from blocks.
As `do_blocks()` is run before `wpautop()` in the_content filter, we can remove in a Just In Time fashion, before that filter is run.

After `wpautop()`s original priority has passed, we can re-add it in a Just Too Late fashion, to ensure it's available if `the_content` filter is run multiple times on a page load.

Merges [43879] and [43881] from the 5.0 branch to trunk.

Props pento, nerrad.
Fixes #45290.

Built from https://develop.svn.wordpress.org/trunk@44226


git-svn-id: http://core.svn.wordpress.org/trunk@44056 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-17 03:06:12 +00:00
Gary Pendergast 423c828330 REST API: Include `block_version` on Post `content` object.
The `block_version` denotes which version of Blocks the `post_content` contains. Introduces new `block_version()` function for versioning Blocks.

Merges [43770] from the 5.0 branch to trunk.

Props danielbachhuber, birgire.
Fixes #43887.

Built from https://develop.svn.wordpress.org/trunk@44127


git-svn-id: http://core.svn.wordpress.org/trunk@43957 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-14 00:55:37 +00:00
desrosj c2f3636e4a Blocks: Parse blocks when displaying posts.
Posts containing blocks are now correctly handled when displaying on the front end, including dynamic blocks and nested blocks.

Props pento.

Merges [43752] to trunk.

See #45109.
Built from https://develop.svn.wordpress.org/trunk@44118


git-svn-id: http://core.svn.wordpress.org/trunk@43948 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-13 22:22:38 +00:00
desrosj 24f247267f Blocks: Introduce the block parser.
The `WP_Block_Parser` class, and the accompanying `parse_blocks()` helper function, can be used to parse an array of blocks out of a content string.

`WP_Block_Parser` is copied from the `@wordpress/block-serialization-default-parser` package. To ensure it stays in sync with the JavaScript parser, changes should be implemented in the package first, then the package version should be upgraded to include the changes.

Props pento.

Merges [43751] to trunk.

See #45109.
Built from https://develop.svn.wordpress.org/trunk@44116


git-svn-id: http://core.svn.wordpress.org/trunk@43946 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-13 17:40:39 +00:00
Gary Pendergast 0f1544dabc Blocks: Introduce `register_block_type()`, `unregister_block_type()`, and `get_dynamic_blocks()` functions.
These helper functions allow easy access to the global block registry.

Merges [43743] from the 5.0 branch to trunk.

See #45109.

Built from https://develop.svn.wordpress.org/trunk@44109


git-svn-id: http://core.svn.wordpress.org/trunk@43939 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-13 09:54:25 +00:00
Gary Pendergast 2d3f734847 Blocks: Introduce `WP_Block_Type` and `WP_Block_Type_Registry` classes.
These are the foundational classes allowing blocks to be registered and used throughout WordPress.

This commit also includes the `has_block()` and `has_blocks()` functions, which are required for unit testing these classes.

Merges [43742] from the 5.0 branch to trunk.

Props adamsilverstein, danielbachhuber, desrosj.
Fixes #45097.
See #45109.

Built from https://develop.svn.wordpress.org/trunk@44108


git-svn-id: http://core.svn.wordpress.org/trunk@43938 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-13 09:44:23 +00:00