fix(offset): preserve source entity layer

src/app/command_driver.rs

@@ -840,6 +840,10 @@ impl OpenCADStudio {
 
     fn apply_cmd_result_inner(&mut self, result: CmdResult) -> Task<Message> {
         let i = self.active_tab;
+        let preserve_commit_layer = self.tabs[i]
+        .active_cmd
+        .as_ref()
+        .is_some_and(|command| command.preserve_commit_layer());
         match result {
             CmdResult::NeedPoint => {
                 // ATTEDIT finished its entity pick: hand the chosen block off to
@@ -935,7 +939,11 @@ impl OpenCADStudio {
                 );
                 let association_enabled =
                     self.tabs[i].scene.document.header.dimension_associativity == 2;
-                let committed = self.commit_entity_handle(entity);
+                let committed = if preserve_commit_layer {
+                    self.commit_entity_handle_preserve_layer(entity)
+                } else {
+                    self.commit_entity_handle(entity)
+                };
                 if is_associative_dimension && association_enabled {
                     if let Some(handle) = committed {
                         let sources = self.tabs[i]
@@ -973,7 +981,11 @@ impl OpenCADStudio {
                     .all(|entity| self.delta_add_safe(i, entity));
                 let pending = self.begin_undo(i, label, entities.len(), delta_safe);
                 for entity in entities {
-                    self.commit_entity(entity);
+                    if preserve_commit_layer {
+                        let _ = self.commit_entity_handle_preserve_layer(entity);
+                    } else {
+                        self.commit_entity(entity);
+                    }
                 }
                 self.tabs[i].dirty = true;
                 self.tabs[i].scene.clear_preview_wire();

src/app/properties.rs

@@ -2596,14 +2596,33 @@ impl OpenCADStudio {
         &mut self,
         entity: acadrust::EntityType,
     ) -> Option<Handle> {
-        self.commit_entity_handle_with_dimension_policy(entity, false)
+        self.commit_entity_handle_with_policies(entity, false, false)
     }
 
-    /// Commit an entity, optionally preserving its source dimension style.
     pub(super) fn commit_entity_handle_with_dimension_policy(
+        &mut self,
+        entity: acadrust::EntityType,
+        preserve_dimension_layer_and_style: bool,
+    ) -> Option<Handle> {
+        self.commit_entity_handle_with_policies(
+            entity,
+            preserve_dimension_layer_and_style,
+            false,
+        )
+    }
+
+    pub(super) fn commit_entity_handle_preserve_layer(
+        &mut self,
+        entity: acadrust::EntityType,
+    ) -> Option<Handle> {
+        self.commit_entity_handle_with_policies(entity, false, true)
+    }
+
+    fn commit_entity_handle_with_policies(
         &mut self,
         mut entity: acadrust::EntityType,
         preserve_dimension_layer_and_style: bool,
+        preserve_entity_layer: bool,
     ) -> Option<Handle> {
         let i = self.active_tab;
         let tracks_dimension_chain = matches!(
@@ -2692,7 +2711,7 @@ impl OpenCADStudio {
         };
         if let Some(layer) = explicit_mleader_layer {
             entity.as_entity_mut().set_layer(layer);
-        } else {
+        } else if !preserve_entity_layer {
             let layer = &self.tabs[i].active_layer;
             if layer != "0" || entity.as_entity().layer().is_empty() {
                 entity.as_entity_mut().set_layer(layer.clone());

src/command.rs

@@ -1734,6 +1734,11 @@ impl InputKind {
 }
 
 pub trait CadCommand: Send {
+    /// Keep the layer already carried by entities committed by this command
+    /// instead of replacing it with the current drawing layer.
+    fn preserve_commit_layer(&self) -> bool {
+        false
+    }
     /// Short name shown in the command line prompt, e.g. `"LINE"`.
     #[allow(dead_code)]
     fn name(&self) -> &'static str;

src/modules/draw/modify/offset.rs

@@ -514,6 +514,9 @@ impl OffsetCommand {
 }
 
 impl CadCommand for OffsetCommand {
+    fn preserve_commit_layer(&self) -> bool {
+        true
+    }
     fn name(&self) -> &'static str {
         "OFFSET"
     }