* Add get_validation_error_count() method.
* Add removable_query_args to prevent persisting on page

…statuses

* Add recognition of amp_validation_error_status query var for amp_invalid_url post queries.
* Indicate in the list of errors on a given invalid URL post which are new, ignored, or acknowledged.

…valid URL details

…nces

…deletion of non-zero-count terms

Add query vars to removable list

…invalid AMP URL post

…eading on edit post screen

… admin menu

Improve column widths for validation errors; hide overflow for details

The before/after inline data is too variable and can cause many duplicate validation errors to accumulate

…lidation errors have been ignored

* Eliminate duplicated logic parsing post_content to obtain validation errors.
* Change "Details" link to "Review Errors" link in edit post screen notice; explain impact of having non-ignored AMP validation errors. Add debug link to notice in Gutenberg.
* Add debug_link to amp_validity REST field.
* Introduce get_invalid_url_validation_errors method as model getter.

…zation where relevant

* Move debug code into AMP_Validation_Utils class.
* Remove disable_invalid_removal sanitizer arg in favor of validation_error_callback

* Run amp_content_sanitizers filter late to apply after sanitizers have been added.
* Wrap any existing validation_error_callback functions which have been supplied to do the handling of the validation error.
* Pass flag to style sanitizer to locate_sources to ensure sources are available for reporting when they'll be needed.
* Add handle_validation_error and set_current_node methods to reduce duplication.
* Fix inclusion of property_value in validation_error.
* Pass debug flag to AMP_Validation_Utils upon init.

* A validation error (like an enqueued script) can come from multiple sources, so these need to be stored separately from the validation error itself. Additionally, the sources will not be available when doing validation at runtime.
* Move storage of sources from term meta to the invalid URL post, where the actual error occurs.
* Remove sources column from validation error term list table. Remove now-invalid searching from term meta.

* Eliminate enqueued_script validation error in favor of merging sources into invalid_element errors
* Add source information for inline scripts attached to enqueued scripts.
* Account for enqueueing script bundles (where src is false).
* Capture inline script contents in validation errors. Fixes #1031.

* Automatically redirect to non-AMP version when validation errors aren't sanitized
* Remove amp attribute when in canonical
* Introduce AMP_Base_Sanitizer::should_sanitize_validation_error() which is responsible for preparing validation error and calling validation_error_callback.
* Add amp_validation_error filter for plugins to customize the properties in a validation error for a given node.
* Add amp_validation_error_sanitized filter so plugins can customization whether a given validation error should be sanitized.
* Keep track of whether a validation error was sanitized, and return whether there are any non-sanitized validation errors via AMP_Validation_Utils::has_blocking_validation_errors().
* Introduce AMP_Base_Sanitizer::prepare_validation_error() for each sanitizer to have control over how its validation errors are constructed.
* Call add_validation_callback unconditionally instead of adding via filters.
* Simplify AMP_Base_Sanitizer::remove_invalid_child() and AMP_Base_Sanitizer::remove_invalid_attribute() now that validation_error_callback is always present.
* Warn and delete validation_error_callback arg passed into prepare_response.
* Add $exit param to AMP_Theme_Support::redirect_canonical_amp() for use in output buffer callback.
* Update dev-lib to fix trailing-slash problem with directory constants.
* Remove obsolete SCRIPTS_PLACEHOLDER constant.

…pdate/validation

…d_URL_Post_Type, and AMP_Validation_Error_Taxonomy

* Pass missing node when reporting excessive_css validation error
* Fix accumulation of validation errors.
* Handle case where sources are null in get_invalid_url_validation_errors().
* Make sure sources are always excluded when computing term slug.
* Defer adding widget callbacks to when widgets are registered.
* Remove majority of messages from validation errors to allow then to be dynamically computed later.
* Normalize illegal_css_at_rule validation errors.
* Improve unrecognized_css validation errors.

…pdate/validation

…ates

… prevent auto-redirect to non-AMP version

…ation errors

…le sanitizer

…ource comments

* Introduce amp_preserve_source_comments query param.
* Rename locate_sources arg to should_locate_sources.
* Remove debug flag for preventing sanitization on all validation errors.
* Rename add_validation_hooks method to add_validation_error_sourcing.

…esults

… when sanitization status changes

Fix additional static analysis issues

Allow passing nonce instead of auth cookie to with amp_validate requests.

Let statuses be changed in bulk on invalid URL screen

* Use wp_json_encode() instead or serialize().
* Ensure window opened for previewing validation error term status changes to have consistent name.
* Use VALIDATION_ERROR_TERM_STATUS_QUERY_VAR constant.

…r overrides

…ction

…pdate/validation