chore: added changes for sorting tooltip content

frontend/src/lib/uPlotV2/components/Tooltip/__tests__/utils.test.ts

@@ -189,7 +189,7 @@ describe('Tooltip utils', () => {
 			];
 		}
 
-		it('builds tooltip content in series-index order with isActive flag set correctly', () => {
+		it('builds tooltip content sorted by value descending with isActive flag set correctly', () => {
 			const data: AlignedData = [[0], [10], [20], [30]];
 			const series = createSeriesConfig();
 			const dataIndexes = [null, 0, 0, 0];
@@ -206,21 +206,21 @@ describe('Tooltip utils', () => {
 			});
 
 			expect(result).toHaveLength(2);
-			// Series are returned in series-index order (A=index 1 before B=index 2)
+			// Sorted by value descending: B (20) before A (10)
 			expect(result[0]).toMatchObject<Partial<TooltipContentItem>>({
-				label: 'A',
-				value: 10,
-				tooltipValue: 'formatted-10',
-				color: '#ff0000',
-				isActive: false,
-			});
-			expect(result[1]).toMatchObject<Partial<TooltipContentItem>>({
 				label: 'B',
 				value: 20,
 				tooltipValue: 'formatted-20',
 				color: 'color-2',
 				isActive: true,
 			});
+			expect(result[1]).toMatchObject<Partial<TooltipContentItem>>({
+				label: 'A',
+				value: 10,
+				tooltipValue: 'formatted-10',
+				color: '#ff0000',
+				isActive: false,
+			});
 		});
 
 		it('skips series with null data index or non-finite values', () => {
@@ -274,7 +274,7 @@ describe('Tooltip utils', () => {
 			expect(result[1].value).toBe(30);
 		});
 
-		it('returns items in series-index order', () => {
+		it('returns items sorted by value descending', () => {
 			// Series values in non-sorted order: 3, 1, 4, 2
 			const data: AlignedData = [[0], [3], [1], [4], [2]];
 			const series: Series[] = [
@@ -297,7 +297,7 @@ describe('Tooltip utils', () => {
 				decimalPrecision,
 			});
 
-			expect(result.map((item) => item.value)).toStrictEqual([3, 1, 4, 2]);
+			expect(result.map((item) => item.value)).toStrictEqual([4, 3, 2, 1]);
 		});
 	});
 });

frontend/src/lib/uPlotV2/components/Tooltip/utils.ts

@@ -142,5 +142,7 @@ export function buildTooltipContent({
 		}
 	}
 
+	items.sort((a, b) => b.value - a.value);
+
 	return items;
 }