Add filter to change honeypot styles

This filter can be used to change the styles of the honeypot field.
It can also use an empty value, and then load the styles from an
external file, if a strict CSP is used for the site.

antispam_bee.php

@@ -1305,11 +1305,25 @@ public static function replace_comment_field_callback( $matches ) {
 			}
 		}
 
+		/**
+		 * Filter to change the inline styles of the honeypot field.
+		 *
+		 * This filter can also be used to use an empty value and load the styles from an external file, if a strict
+		 * CSP is used for the site.
+		 *
+		 * @see: https://wordpress.org/support/topic/honeypot-textarea-visible-with-strict-csp-header/
+		 *
+		 * @param string $honeypot_styles The inline styles for the honeypot.
+		 *
+		 * @return string The inline styles for the honeypot.
+		 */
+		$honeypot_styles = apply_filters( 'antispam_bee_honeypot_styles', 'padding:0 !important;clip:rect(1px, 1px, 1px, 1px) !important;position:absolute !important;white-space:nowrap !important;height:1px !important;width:1px !important;overflow:hidden !important;' );
+
 		$output .= ' name="' . esc_attr( self::get_secret_name_for_post( self::$_current_post_id ) ) . '" ';
 		$output .= $matches['between1'] . $matches['between2'] . $matches['between3'];
 		$output .= $matches['after'] . '>';
 		$output .= $matches['content'];
-		$output .= '</textarea><textarea id="comment" aria-label="hp-comment" aria-hidden="true" name="comment" autocomplete="new-password" style="padding:0 !important;clip:rect(1px, 1px, 1px, 1px) !important;position:absolute !important;white-space:nowrap !important;height:1px !important;width:1px !important;overflow:hidden !important;" tabindex="-1"></textarea>';
+		$output .= '</textarea><textarea id="comment" aria-label="hp-comment" aria-hidden="true" name="comment" autocomplete="new-password" style="' . esc_attr( $honeypot_styles ) . '" tabindex="-1"></textarea>';
 
 		$output .= $id_script;
 		$output .= $init_time_field;