Stabilize the PreSavePost and SavePost filters (#64198)

* Stabilize the PreSavePost and SavePost filters

* Use lowercase names

* Use async hooks

packages/edit-post/src/store/actions.js

@@ -8,7 +8,7 @@ import {
 	privateApis as editorPrivateApis,
 } from '@wordpress/editor';
 import deprecated from '@wordpress/deprecated';
-import { addFilter } from '@wordpress/hooks';
+import { addAction } from '@wordpress/hooks';
 import { store as coreStore } from '@wordpress/core-data';
 
 /**
@@ -478,21 +478,14 @@ export const initializeMetaBoxes =
 		metaBoxesInitialized = true;
 
 		// Save metaboxes on save completion, except for autosaves.
-		addFilter(
-			'editor.__unstableSavePost',
+		addAction(
+			'editor.savePost',
 			'core/edit-post/save-metaboxes',
-			( previous, options ) =>
-				previous.then( () => {
-					if ( options.isAutosave ) {
-						return;
-					}
-
-					if ( ! select.hasMetaBoxes() ) {
-						return;
-					}
-
-					return dispatch.requestMetaBoxUpdates();
-				} )
+			async ( options ) => {
+				if ( ! options.isAutosave && select.hasMetaBoxes() ) {
+					await dispatch.requestMetaBoxUpdates();
+				}
+			}
 		);
 
 		dispatch( {

packages/editor/src/store/actions.js

@@ -12,7 +12,11 @@ import {
 import { store as noticesStore } from '@wordpress/notices';
 import { store as coreStore } from '@wordpress/core-data';
 import { store as blockEditorStore } from '@wordpress/block-editor';
-import { applyFilters } from '@wordpress/hooks';
+import {
+	applyFilters,
+	applyFiltersAsync,
+	doActionAsync,
+} from '@wordpress/hooks';
 import { store as preferencesStore } from '@wordpress/preferences';
 import { __ } from '@wordpress/i18n';
 
@@ -184,7 +188,7 @@ export const savePost =
 		}
 
 		const previousRecord = select.getCurrentPost();
-		const edits = {
+		let edits = {
 			id: previousRecord.id,
 			...registry
 				.select( coreStore )
@@ -199,9 +203,9 @@ export const savePost =
 
 		let error = false;
 		try {
-			error = await applyFilters(
-				'editor.__unstablePreSavePost',
-				Promise.resolve( false ),
+			edits = await applyFiltersAsync(
+				'editor.preSavePost',
+				edits,
 				options
 			);
 		} catch ( err ) {
@@ -236,14 +240,25 @@ export const savePost =
 				);
 		}
 
+		// Run the hook with legacy unstable name for backward compatibility
 		if ( ! error ) {
-			await applyFilters(
-				'editor.__unstableSavePost',
-				Promise.resolve(),
-				options
-			).catch( ( err ) => {
+			try {
+				await applyFilters(
+					'editor.__unstableSavePost',
+					Promise.resolve(),
+					options
+				);
+			} catch ( err ) {
 				error = err;
-			} );
+			}
+		}
+
+		if ( ! error ) {
+			try {
+				await doActionAsync( 'editor.savePost', options );
+			} catch ( err ) {
+				error = err;
+			}
 		}
 		dispatch( { type: 'REQUEST_POST_UPDATE_FINISH', options } );