recursively handle lists in measure method

Author: dwarring

lib/CSS/Properties/Calculator.rakumod

@@ -136,7 +136,11 @@ class CSS::Properties::Calculator {
                 .(self, $v, :$ref);
             }
             else {
-                $.measure($v, :$ref);
+                given $.measure($v, :$ref) {
+                    .isa(List)
+                        ??  [ $v.map: {$.measure($_, :$ref)} ]
+                        !!  $v;
+                }
             }
         }
     }

t/measure.t

@@ -1,6 +1,6 @@
 use v6;
 use Test;
-plan 27;
+plan 28;
 
 use CSS::Units :pt, :px, :pc, :in, :vw, :vh, :em, :ex, :percent;
 use CSS::Properties;
@@ -27,6 +27,9 @@ is '%0.2f'.sprintf($css.measure: :font-size<thick>), '3.00', '$css.measure("thic
 is '%0.2f'.sprintf($css.measure: :font-size<x-large>), '18.00', '$css.measure("x-large")';
 is '%0.2f'.sprintf($css.measure: :font-size<smaller>), '10.00', '$css.measure("smaller")';
 
+$css .= new: :style("border-spacing: 3pt .75em");
+is $css.measure(:border-spacing), [3.0, 9.0];
+
 # change base units
 $css .= new: :units<pc>;
 is $css.units, 'pc', 'changed units';