Jetpack CRM: Ensure admin color schemes have at least 4 color entries (WordPress#1700)

* Jetpack CRM: Ensure admin color schemes have at least 4 color entries

Workaround for zero-bs-crm accessing index 3 of admin color scheme
colors array when some schemes only define 3 colors. Only applies
when CRM is active (ZBS_PLUGIN_DIR defined).

See Automattic/jetpack#47143

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix PHPCS linting errors in crm.php

- One argument per line in multi-line function calls
- Avoid count() inside loop condition

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dd32

public_html/wp-content/mu-plugins/jetpack-tweaks/crm.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace WordCamp\Jetpack_Tweaks;
+
+defined( 'WPINC' ) || die();
+
+/**
+ * Ensure admin color schemes have at least 4 color entries.
+ *
+ * Workaround for zero-bs-crm accessing index 3 of `$_wp_admin_css_colors[scheme]->colors`
+ * when some color schemes only define 3 colors.
+ *
+ * @see ZeroBSCRM.AdminStyling.php:264
+ * @see https://github.com/Automattic/jetpack/pull/47143
+ */
+add_action(
+	'admin_head',
+	function () {
+		if ( ! defined( 'ZBS_PLUGIN_DIR' ) ) {
+			return;
+		}
+
+		global $_wp_admin_css_colors;
+
+		$current_color = get_user_option( 'admin_color' );
+
+		if ( ! isset( $_wp_admin_css_colors[ $current_color ] ) ) {
+			return;
+		}
+
+		$colors     = &$_wp_admin_css_colors[ $current_color ]->colors;
+		$color_count = count( $colors );
+
+		while ( $color_count < 4 ) {
+			$colors[] = end( $colors );
+			$color_count++;
+		}
+	},
+	9
+);