fix(plugin): drive headless tasks, invalidate layer cache, and handle cancel event

crates/ocs_plugin_api/src/ipc/client.rs

@@ -419,7 +419,12 @@ impl HostApi for PluginHostApi {
 
     fn add_layer(&mut self, config: crate::host::LayerConfig) -> Option<Handle> {
         match self.client.request(PluginRequest::AddLayer(config)) {
-            Ok(PluginResponse::OptHandle(h)) => h,
+            Ok(PluginResponse::OptHandle(h)) => {
+                if h.is_some() {
+                    self.document_cache = OnceCell::new();
+                }
+                h
+            }
             Ok(other) => {
                 eprintln!("[plugin] unexpected AddLayer response: {other:?}");
                 None
@@ -433,7 +438,12 @@ impl HostApi for PluginHostApi {
 
     fn modify_layer(&mut self, config: crate::host::LayerConfig) -> bool {
         match self.client.request(PluginRequest::ModifyLayer(config)) {
-            Ok(PluginResponse::Bool(b)) => b,
+            Ok(PluginResponse::Bool(b)) => {
+                if b {
+                    self.document_cache = OnceCell::new();
+                }
+                b
+            }
             Ok(other) => {
                 eprintln!("[plugin] unexpected ModifyLayer response: {other:?}");
                 false

crates/ocs_plugin_api/src/ipc/protocol.rs

@@ -27,9 +27,14 @@ pub use acadrust::{CadDocument, EntityType, Handle};
 /// Events the host forwards to an active plugin `InteractiveCommand`.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum InteractiveEvent {
+    /// User clicked or specified a point coordinate.
     Point([f64; 3]),
+    /// User pressed Enter or Return to complete input.
     Enter,
+    /// User selected an existing entity in the drawing.
     ObjectPick { handle: Handle, pt: [f64; 3] },
+    /// User cancelled the prompt (e.g. pressed ESC), resetting interactive collection.
+    Cancel,
 }
 
 /// Initial handshake sent by the plugin runner immediately after connecting.

crates/ocs_plugin_api/src/ipc/v4/client.rs

@@ -733,7 +733,12 @@ impl HostApi for V4PluginHostApi {
 
     fn add_layer(&mut self, config: crate::host::LayerConfig) -> Option<Handle> {
         match self.request(PluginRequest::AddLayer(config)) {
-            Ok(PluginResponse::OptHandle(h)) => h,
+            Ok(PluginResponse::OptHandle(h)) => {
+                if h.is_some() {
+                    self.document_cache = OnceCell::new();
+                }
+                h
+            }
             Ok(other) => {
                 eprintln!("[plugin] unexpected AddLayer response: {other:?}");
                 None
@@ -747,7 +752,12 @@ impl HostApi for V4PluginHostApi {
 
     fn modify_layer(&mut self, config: crate::host::LayerConfig) -> bool {
         match self.request(PluginRequest::ModifyLayer(config)) {
-            Ok(PluginResponse::Bool(b)) => b,
+            Ok(PluginResponse::Bool(b)) => {
+                if b {
+                    self.document_cache = OnceCell::new();
+                }
+                b
+            }
             Ok(other) => {
                 eprintln!("[plugin] unexpected ModifyLayer response: {other:?}");
                 false