+{
+ our %mods;
+ our $last_mod = 0;
+
+ sub mods_unique {
+ my ($set) = @_;
+
+ my (@mods, $has_layer);
+MOD:
+ for my $mod ($set->mods) {
+ $has_layer = 1 if $ltml_tc->check($mod);
+ my $tag = $mod->tag;
+ my $old = $mods{$tag} || [];
+ for (@$old) {
+ next MOD if $_->[0]->cover($mod);
+ }
+ push @{$mods{$tag}}, [ $mod, $last_mod++ ];
+ push @mods, $mod;
+ }
+
+ if ($has_layer) {
+ # Clips and mods don't propagate through layers. Hence if a layer is set,
+ # force their reuse.
+ @mods = map $_->[0], sort { $a->[1] <=> $b->[1] } map @$_, values %mods;
+ }
+
+ return @mods;
+ }
+
+ 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 = $set->mods_unique;
+
+ my $body = $set->$orig($tikz);
+
+ if (@mods) {
+ $body = LaTeX::TikZ::Scope->new
+ ->mod(map $_->apply($tikz), @mods)
+ ->body($body);
+ }
+
+ $body;
+ };
+}