Show Template: Refactor rendering mode management in editor provider and store to persist it

packages/editor/src/components/provider/index.js

@@ -189,13 +189,17 @@ export const ExperimentalEditorProvider = withRegistryProvider(
 					coreStore
 				).hasFinishedResolution( 'getPostType', [ post.type ] );
 
+				const renderingMode = getRenderingMode();
+
 				return {
 					hasLoadedPostObject: _hasLoadedPostObject,
 					editorSettings: getEditorSettings(),
 					isReady: __unstableIsEditorReady(),
-					mode: getRenderingMode(),
+					mode: renderingMode,
 					defaultMode:
-						postTypeObject?.default_rendering_mode ?? 'post-only',
+						renderingMode ??
+						postTypeObject?.default_rendering_mode ??
+						'post-only',
 					selection: getEditorSelection(),
 					postTypeEntities:
 						post.type === 'wp_template'
@@ -327,8 +331,13 @@ export const ExperimentalEditorProvider = withRegistryProvider(
 
 		// Sets the right rendering mode when loading the editor.
 		useEffect( () => {
+			// If mode equals default mode, rendering mode is already set appropriately.
+			if ( mode === defaultMode ) {
+				return;
+			}
+
 			setRenderingMode( defaultMode );
-		}, [ defaultMode, setRenderingMode ] );
+		}, [ mode, defaultMode, setRenderingMode ] );
 
 		useHideBlocksFromInserter( post.type, mode );
 

packages/editor/src/store/actions.js

@@ -663,10 +663,9 @@ export const setRenderingMode =
 			dispatch.editPost( { selection: undefined }, { undoIgnore: true } );
 		}
 
-		dispatch( {
-			type: 'SET_RENDERING_MODE',
-			mode,
-		} );
+		registry
+			.dispatch( preferencesStore )
+			.set( 'core', 'renderingMode', mode );
 	};
 
 /**

packages/editor/src/store/reducer.js

@@ -267,15 +267,6 @@ export function editorSettings( state = EDITOR_SETTINGS_DEFAULTS, action ) {
 	return state;
 }
 
-export function renderingMode( state = 'post-only', action ) {
-	switch ( action.type ) {
-		case 'SET_RENDERING_MODE':
-			return action.mode;
-	}
-
-	return state;
-}
-
 /**
  * Reducer returning the editing canvas device type.
  *
@@ -395,7 +386,6 @@ export default combineReducers( {
 	postSavingLock,
 	editorSettings,
 	postAutosavingLock,
-	renderingMode,
 	deviceType,
 	removedPanels,
 	blockInserterPanel,

packages/editor/src/store/selectors.js

@@ -1287,9 +1287,9 @@ export function getEditorSettings( state ) {
  *
  * @return {string} Rendering mode.
  */
-export function getRenderingMode( state ) {
-	return state.renderingMode;
-}
+export const getRenderingMode = createRegistrySelector( ( select ) => () => {
+	return select( preferencesStore ).get( 'core', 'renderingMode' );
+} );
 
 /**
  * Returns the current editing canvas device type.