Fix cloning of 'em'

Closes #23.

Author: dwarring

Changes

@@ -1,12 +1,13 @@
 {{$NEXT}}
+    - Fix cloning of 'em' #23
 
 0.9.6  2024-08-29T06:32:07+12:00
     - Add FontConf 0.1.4+ :best($n) and :all options to
       find-font() method
     - Fix inheritance of font-size via inherit() method
 
 0.9.5  2022-09-30T05:13:03+13:00
-    - fix parsing of rgb/hsl alpha channel as a percentage
+    - Fix parsing of rgb/hsl alpha channel as a percentage
 
 0.9.4  2022-09-07T06:58:00+12:00
     Finesse tests & doc for CSS::Module 0.6.6, which supports:

lib/CSS/Properties.rakumod

@@ -172,7 +172,7 @@ class CSS::Properties:ver<0.9.6>:api<0.9> {
                 // die "module {$!module.name} lacks an index";
             $!properties //= (%module-properties{$!module} //= []);
         }
-        $!calc .= new: :css(self), :$units, :$viewport-width, :$viewport-height, :$reference-width, :$user-width;
+        $!calc .= new: :css(self), :$units, :$viewport-width, :$viewport-height, :$reference-width, :$user-width, :$em;
 
         my @style = .list with $declarations;
         @style.append: self!parse-style($_) with $style;

t/css-fonts.t

@@ -1,6 +1,6 @@
 use v6;
 use Test;
-plan 2;
+plan 3;
 use CSS::Properties;
 
 my $style = 'font:italic bold 10pt/12pt times-roman;';
@@ -36,4 +36,9 @@ subtest 'serialization' => {
     }
 }
 
+subtest 'issue#23', {
+    my CSS::Properties $css .= new: :style("font-size:.85em");
+    is $css.clone.measure(:font-size), $css.measure(:font-size);
+}
+
 done-testing;