fix: opacity flicker

Author: asuzuki-jumptrading

src/features/Overview/ShredsProgression/shredsProgressionPlugin.ts

@@ -676,16 +676,19 @@ function getGroupTsDeltas(
       .filter((v) => v !== undefined);
 
     if (definedSlotTsDeltas.length === 0) {
+      // no slots, no group
       continue;
     }
 
     // ignore missing slots at the start when positioning group
     const minStart = Math.min(...definedSlotTsDeltas.map(([start]) => start));
-    const ends = definedSlotTsDeltas.map(([, end]) => end);
-    const definedEnds = ends.filter((end) => end !== undefined);
+
+    const definedEnds = definedSlotTsDeltas
+      .map(([, end]) => end)
+      .filter((end) => end !== undefined);
 
     // undefined slot end will extend to max x
-    const hasUndefinedEnd = ends.length > definedEnds.length;
+    const hasUndefinedEnd = slotsPerLeader > definedEnds.length;
     const maxEnd = hasUndefinedEnd ? undefined : Math.max(...definedEnds);
 
     groupTsDeltas[leaderSlot] = [minStart, maxEnd];