Block Bindings: Add block_bindings_supported_attributes filter

backport-changelog/6.9/9891.md

@@ -0,0 +1,3 @@
+https://github.com/WordPress/wordpress-develop/pull/9891
+
+* https://github.com/WordPress/gutenberg/pull/71663

lib/compat/wordpress-6.9/block-bindings.php

@@ -112,6 +112,20 @@ function gutenberg_process_block_bindings( $instance ) {
 		$block_bindings_supported_attributes_6_8[ $block_type ] ??
 		array();
 
+	/**
+	 * Filters the supported block attributes for block bindings.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string[] $supported_block_attributes The block's attributes that are supported by block bindings.
+	 * @param string   $block_type                 The block type whose attributes are being filtered.
+	 */
+	$supported_block_attributes = apply_filters(
+		'block_bindings_supported_attributes',
+		$supported_block_attributes,
+		$block_type
+	);
+
 	/**
 	 * Filters the supported block attributes for block bindings.
 	 *