+{
+ our %mods;
+ our $last_mod = 0;
+
+ around 'draw' => sub {
+ my ($orig, $set, $tikz) = @_;
+
+ local $last_mod = $last_mod;
+
+ # Save a deep copy
+ my %saved_idx = map { $_ => $#{$mods{$_}} } keys %mods;
+ my $guard = Scope::Guard->new(sub {
+ for (keys %mods) {
+ if (exists $saved_idx{$_}) {
+ $#{$mods{$_}} = $saved_idx{$_};
+ } else {
+ delete $mods{$_};
+ }
+ }
+ });
+
+ my (@mods, $last_layer);
+MOD:
+ for my $mod ($set->mods) {
+ my $is_layer = $ltml_tc->check($mod);
+ $last_layer = $mod if $is_layer;
+ my $tag = $mod->tag;
+ my $old = $mods{$tag} || [];
+ for (@$old) {
+ next MOD if $_->[0]->covers($mod);
+ }
+ push @{$mods{$tag}}, [ $mod, $last_mod++, $is_layer ];
+ push @mods, $mod;
+ }
+
+ if ($last_layer) {
+ # Clips and mods don't propagate through layers. Hence if a layer is set,
+ # force their reuse.
+ @mods = $last_layer;
+ push @mods, map $_->[0],
+ sort { $a->[1] <=> $b->[1] }
+ grep !$_->[2],
+ map @$_,
+ values %mods;
+ }
+
+ my $body = $set->$orig($tikz);
+
+ if (@mods) {
+ $body = LaTeX::TikZ::Scope->new
+ ->mod(map $_->apply($tikz), @mods)
+ ->body($body);
+ }
+
+ $body;
+ };
+}
+
+=head2 C<layer $layer>
+
+Puts the current set in the corresponding layer.
+This is a shortcut for C<< $set->mod(Tikz->layer($layer)) >>.
+
+=cut