feat: prevent partial selection of combo items by toggling entire combo groups in SplitBillScreen

static/src/app/screens/split_bill_screen/split_bill_screen_patch.js

@@ -5,9 +5,36 @@ import { patch } from "@web/core/utils/patch";
 
 patch(SplitBillScreen.prototype, {
     onClickLine(line) {
+        // Block clicking on combo sub-items directly.
+        // The parent line handles the entire combo group selection.
         if (line.combo_parent_id) {
             return;
         }
+
+        // For combo parent lines, toggle all lines in the combo group at once.
+        // This prevents partial selection of combo sub-items.
+        if (line.combo_line_ids && line.combo_line_ids.length > 0) {
+            const allLines = line.getAllLinesInCombo();
+
+            // Determine current state: are ALL lines already at their max qty?
+            const allAtMax = allLines.every(
+                (l) => (this.qtyTracker[l.uuid] || 0) === l.getQuantity()
+            );
+
+            for (const l of allLines) {
+                const uuid = l.uuid;
+                const maxQty = l.getQuantity();
+
+                // Toggle: if all are at max -> reset to 0; otherwise -> set to max
+                this.qtyTracker[uuid] = allAtMax ? 0 : maxQty;
+                this.priceTracker[uuid] =
+                    (l.prices.total_included / l.qty) * this.qtyTracker[uuid];
+                this.setLineQtyStr(l);
+            }
+            return;
+        }
+
+        // For regular (non-combo) lines, use default behavior.
         super.onClickLine(line);
     }
 });