Paste Layer Style: a group's Pass Through pastes onto other layers as Normal; style clipboard comment

crates/engine/src/extra_cmds.rs

@@ -930,7 +930,13 @@ pub fn specs() -> Vec<CommandSpec> {
                     for id in ids {
                         let l = doc.layer_mut(id).ok_or(EngineError::NoLayer(id))?;
                         l.effects = fx.clone();
-                        l.blend = style.blend;
+                        // Pass Through is a group's mode: a group's style pastes onto other layers as
+                        // Normal, as a merged group's Pass Through becomes Normal.
+                        l.blend = if style.blend == photocraft_color::BlendMode::PassThrough && !l.is_group() {
+                            photocraft_color::BlendMode::Normal
+                        } else {
+                            style.blend
+                        };
                         l.fill_opacity = style.fill;
                         l.advanced = style.advanced;
                         l.blend_if = blend_if.clone();

crates/engine/src/lib.rs

@@ -432,8 +432,8 @@ pub struct Session {
     coalesce_request: Option<String>,
     /// Pixels copied with Edit › Copy / Cut (shared by all documents, like Photoshop).
     pub clipboard: Option<edit_cmds::Clip>,
-    /// Layer › Layer Style › Copy Layer Style: effects, blend mode, fill opacity and the Advanced
-    /// Blending switches.
+    /// Layer › Layer Style › Copy Layer Style: the effects and the Blending Options
+    /// ([`CopiedStyle`]: blend mode, fill opacity, Advanced Blending, Blend If, channels).
     pub style_clipboard: Option<CopiedStyle>,
     /// Shape path context menu: copied vector fill and stroke styles.
     pub path_fill_clipboard: Option<photocraft_doc::Fill>,

crates/engine/tests/style_and_align.rs

@@ -97,3 +97,19 @@ fn several_layers_align_to_an_active_selection() {
         assert_eq!(x0, 40, "layer {id} aligned to the selection's left edge");
     }
 }
+
+#[test]
+fn a_groups_pass_through_pastes_onto_a_pixel_layer_as_normal() {
+    let mut s = Session::new();
+    let (a, _) = new_doc(&mut s, "rgb");
+    let g = s.execute("layer.new.group", json!({})).unwrap()["layer"].as_u64().unwrap();
+    assert_eq!(layer(&s, g).blend, photocraft_color::BlendMode::PassThrough);
+    s.execute("layer.layerStyle.copyLayerStyle", json!({"layer": g})).unwrap();
+    s.execute("layer.layerStyle.pasteLayerStyle", json!({"layer": a})).unwrap();
+    assert_eq!(layer(&s, a).blend, photocraft_color::BlendMode::Normal, "Pass Through isn't a pixel layer's mode");
+    // Onto another group it stays Pass Through.
+    let g2 = s.execute("layer.new.group", json!({})).unwrap()["layer"].as_u64().unwrap();
+    s.execute("layer.setProps", json!({"layer": g2, "blend": "Multiply"})).unwrap();
+    s.execute("layer.layerStyle.pasteLayerStyle", json!({"layer": g2})).unwrap();
+    assert_eq!(layer(&s, g2).blend, photocraft_color::BlendMode::PassThrough);
+}