Fix: Custom font size taking over fit text.

Fixes an issue where if a paragraph/heading had a custom font size and then was conververted to the stretchy variation. The custom font size on the front end was applied instead of fit text.

Developed in: #10517.

Props jorgefilipecosta, mcsf, mrwweb, t-hamano.
Fixes #64254.

git-svn-id: https://develop.svn.wordpress.org/branches/6.9@61251 602fd350-edb4-49c9-b593-d223f7449a82

Author: jorgefilipecosta

src/wp-includes/block-supports/typography.php

@@ -306,7 +306,7 @@ function wp_typography_get_preset_inline_style_value( $style_value, $css_propert
  * @return string Filtered block content.
  */
 function wp_render_typography_support( $block_content, $block ) {
-	if ( ! empty( $block['attrs']['fitText'] ) && ! is_admin() ) {
+	if ( ! empty( $block['attrs']['fitText'] ) && $block['attrs']['fitText'] && ! is_admin() ) {
 		wp_enqueue_script_module( '@wordpress/block-editor/utils/fit-text-frontend' );
 
 		// Add Interactivity API directives for fit text to work with client-side navigation.
@@ -322,6 +322,8 @@ function wp_render_typography_support( $block_content, $block ) {
 				$block_content = $processor->get_updated_html();
 			}
 		}
+		// fitText supersedes any other typography features
+		return $block_content;
 	}
 	if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {
 		return $block_content;