Fix: Custom font size taking over fit text. (#73241)

Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: mcsf <mcsf@git.wordpress.org>
Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: mrwweb <mrwweb@git.wordpress.org>

Author: 4 people

backport-changelog/6.9/10517.md

@@ -0,0 +1,3 @@
+https://github.com/WordPress/wordpress-develop/pull/10517
+
+* https://github.com/WordPress/gutenberg/pull/73241

lib/block-supports/typography.php

@@ -244,7 +244,7 @@ function gutenberg_typography_get_preset_inline_style_value( $style_value, $css_
  * @return string                Filtered block content.
  */
 function gutenberg_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.
@@ -260,6 +260,8 @@ function gutenberg_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'] ) ) {