Motion analysis: a check that runs out before its first step says so, Contact sets offered only when one is active

crates/engine/src/cmd/motion_analysis.rs

@@ -391,6 +391,10 @@ pub(super) fn interference(s: &mut Session, p: &Value) -> Result<Value> {
         }
         Ok(true)
     })?;
+    // Nothing checked is not clear.
+    if truncated && checked == 0 {
+        return Err(bad(cmd, "the check ran out of its work budget before its first step: check fewer parts (occurrences, against)"));
+    }
     let mut list: Vec<(&(u64, u64), &Collision)> = found.iter().collect();
     list.sort_by_key(|(_, c)| c.samples.first().copied().unwrap_or(usize::MAX));
     let mut booleans = MAX_BOOLEANS;

crates/ui-egui/src/dialogs_motion_plot.rs

@@ -248,7 +248,9 @@ fn collision_rows(
 ) {
     // Collisions over the whole study: of the picked components (against the other picks, if
     // any), else among all components or in the contact sets.
-    let sets = !app.session.doc.assembly.contact_sets.is_empty() || app.session.doc.assembly.contact_all;
+    // Offered when there is a set to check (suppressed ones don't count).
+    let assembly = &app.session.doc.assembly;
+    let sets = assembly.contact_all || assembly.contact_sets.iter().any(|c| !c.suppressed);
     a.among = if sets { a.among.min(1) } else { 0 };
     let (parts, against) = (picked_occurrences(&app.session, inputs, 1), picked_occurrences(&app.session, inputs, 2));
     let among = if !parts.is_empty() {