UPDATEFIELD: count fields as the reference does

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/commands/count.rs

@@ -546,6 +546,9 @@ impl OpenCADStudio {
     /// its attributes and the texts of its block definition; a table, the
     /// cell texts of its drawing (its `*T` block).
     fn update_fields(&mut self, i: usize, handles: &[Handle]) {
+        if handles.is_empty() {
+            return;
+        }
         let doc = &self.tabs[i].scene.document;
         let mut hosts = handles.to_vec();
         for h in handles {
@@ -572,25 +575,26 @@ impl OpenCADStudio {
             })
             .flatten()
             .collect();
-        let found = hosts
+        let hosting = hosts.iter().any(|h| match doc.get_entity(*h) {
-            .iter()
+            Some(entity) => crate::entities::field::hosts_field(doc, entity),
-            .filter(|h| match doc.get_entity(**h) {
+            None => attributes
-                Some(entity) => crate::entities::field::hosts_field(doc, entity),
+                .iter()
-                None => attributes.iter().any(|common| {
+                .any(|common| common.handle == *h && crate::entities::field::common_hosts_field(doc, common)),
-                    common.handle == **h && crate::entities::field::common_hosts_field(doc, common)
+        });
-                }),
+        if !hosting {
-            })
+            self.command_line.push_output(&crate::tf!("{found} field(s) found.", found = 0));
-            .count();
+            self.command_line.push_output(&crate::tf!("{updated} field(s) updated.", updated = 0));
-        self.command_line.push_output(&crate::tf!("{found} field(s) found."));
-        if found == 0 {
             return;
         }
+        // The reference counts fields, not the texts holding them, and
+        // reports every field it evaluated as updated, changed or not.
         self.push_undo_snapshot(i, "UPDATEFIELD");
-        let updated = self.tabs[i].scene.update_fields(32, Some(&hosts));
+        let (changed, found) = self.tabs[i].scene.update_fields(32, Some(&hosts));
-        if updated > 0 {
+        if changed > 0 {
             self.tabs[i].dirty = true;
         }
-        self.command_line.push_output(&crate::tf!("{updated} field(s) updated."));
+        self.command_line.push_output(&crate::tf!("{found} field(s) found."));
+        self.command_line.push_output(&crate::tf!("{updated} field(s) updated.", updated = found));
     }
 
     /// A count table at `point`: `Item` | `Count`, one row per block (all

src/scene/mod.rs

@@ -3419,13 +3419,14 @@ impl Scene {
 
     /// Update the fields an evaluation event re-evaluates (see
     /// [`crate::entities::field::update_fields`]) and redraw the hosts whose
-    /// text changed. Returns the number of fields the hosts hold.
+    /// text changed. Returns the number of hosts whose text changed and the
-    pub fn update_fields(&mut self, event: i32, hosts: Option<&[Handle]>) -> usize {
+    /// number of fields the hosts hold.
-        let changed = crate::entities::field::update_fields(&mut self.document, event, hosts).0;
+    pub fn update_fields(&mut self, event: i32, hosts: Option<&[Handle]>) -> (usize, usize) {
+        let (changed, found) = crate::entities::field::update_fields(&mut self.document, event, hosts);
         if !changed.is_empty() {
             self.bump_text_hosts(&changed);
         }
-        changed.len()
+        (changed.len(), found)
     }
 
     /// Redraw text hosts whose stored text changed (re-evaluated fields). An