Fix board reloading page every second.

Thanks to xet7 !

client/components/boards/boardBody.js

@@ -17,6 +17,8 @@ BlazeComponent.extendComponent({
     this.isConverting = new ReactiveVar(false);
     this.isMigrating = new ReactiveVar(false);
     this._swimlaneCreated = new Set(); // Track boards where we've created swimlanes
+    this._boardProcessed = false; // Track if board has been processed
+    this._lastProcessedBoardId = null; // Track last processed board ID
 
     // The pattern we use to manually handle data loading is described here:
     // https://kadira.io/academy/meteor-routing-guide/content/subscriptions-and-data-management/using-subs-manager
@@ -28,19 +30,31 @@ BlazeComponent.extendComponent({
       
       const handle = subManager.subscribe('board', currentBoardId, false);
       
-      Tracker.nonreactive(() => {
+      // Use a separate autorun for subscription ready state to avoid reactive loops
-        Tracker.autorun(() => {
+      this.subscriptionReadyAutorun = Tracker.autorun(() => {
         if (handle.ready()) {
+          // Only run conversion/migration logic once per board
+          if (!this._boardProcessed || this._lastProcessedBoardId !== currentBoardId) {
+            this._boardProcessed = true;
+            this._lastProcessedBoardId = currentBoardId;
+            
             // Ensure default swimlane exists (only once per board)
             this.ensureDefaultSwimlane(currentBoardId);
             // Check if board needs conversion
             this.checkAndConvertBoard(currentBoardId);
+          }
         } else {
           this.isBoardReady.set(false);
         }
       });
     });
-    });
+  },
+
+  onDestroyed() {
+    // Clean up the subscription ready autorun to prevent memory leaks
+    if (this.subscriptionReadyAutorun) {
+      this.subscriptionReadyAutorun.stop();
+    }
   },
 
   ensureDefaultSwimlane(boardId) {
@@ -441,10 +455,14 @@ BlazeComponent.extendComponent({
     this._isDragging = false;
     // Used to set the overlay
     this.mouseHasEnterCardDetails = false;
+    this._sortFieldsFixed = new Set(); // Track which boards have had sort fields fixed
 
     // fix swimlanes sort field if there are null values
     const currentBoardData = Utils.getCurrentBoard();
     if (currentBoardData && Swimlanes) {
+      const boardId = currentBoardData._id;
+      // Only fix sort fields once per board to prevent reactive loops
+      if (!this._sortFieldsFixed.has(`swimlanes-${boardId}`)) {
         const nullSortSwimlanes = currentBoardData.nullSortSwimlanes();
         if (nullSortSwimlanes.length > 0) {
           const swimlanes = currentBoardData.swimlanes();
@@ -458,10 +476,15 @@ BlazeComponent.extendComponent({
             count += 1;
           });
         }
+        this._sortFieldsFixed.add(`swimlanes-${boardId}`);
+      }
     }
 
     // fix lists sort field if there are null values
     if (currentBoardData && Lists) {
+      const boardId = currentBoardData._id;
+      // Only fix sort fields once per board to prevent reactive loops
+      if (!this._sortFieldsFixed.has(`lists-${boardId}`)) {
         const nullSortLists = currentBoardData.nullSortLists();
         if (nullSortLists.length > 0) {
           const lists = currentBoardData.lists();
@@ -475,6 +498,8 @@ BlazeComponent.extendComponent({
             count += 1;
           });
         }
+        this._sortFieldsFixed.add(`lists-${boardId}`);
+      }
     }
   },
   onRendered() {