fix tooltip shows data for different X value (#42299)

frontend/src/metabase/visualizations/echarts/cartesian/model/dataset.ts

@@ -244,7 +244,7 @@ export const getNormalizedDatasetTransform = (
 
     // Copy the dimension value
     const normalizedDatum: Datum = {
-      [X_AXIS_DATA_KEY]: datum[X_AXIS_DATA_KEY],
+      ...datum,
     };
 
     // Compute normalized values for metrics
@@ -536,7 +536,10 @@ const interpolateTimeSeriesData = (
 
   for (let i = 0; i < dataset.length; i++) {
     const datum = dataset[i];
-    result.push(datum);
+    result.push({
+      ...datum,
+      [ORIGINAL_INDEX_DATA_KEY]: datum[ORIGINAL_INDEX_DATA_KEY] ?? i,
+    });
 
     if (i === dataset.length - 1) {
       break;
@@ -545,7 +548,7 @@ const interpolateTimeSeriesData = (
     const end = parseTimestamp(dataset[i + 1][X_AXIS_DATA_KEY]);
 
     let start = parseTimestamp(datum[X_AXIS_DATA_KEY]);
-    while (start.add(count, unit).isBefore(end)) {
+    while (start.add(count, unit).isBefore(end, unit)) {
       const interpolatedValue = start.add(count, unit);
       result.push({
         [X_AXIS_DATA_KEY]: interpolatedValue.toISOString(),

frontend/src/metabase/visualizations/echarts/cartesian/model/dataset.unit.spec.ts

@@ -360,13 +360,17 @@ describe("dataset transform functions", () => {
       expect(result).toEqual([
         {
           [X_AXIS_DATA_KEY]: "A",
+          dimensionKey: "A",
           series1: 1 / 3,
           series2: 2 / 3,
+          unusedSeries: 100,
         },
         {
           [X_AXIS_DATA_KEY]: "B",
+          dimensionKey: "B",
           series1: 3 / 7,
           series2: 4 / 7,
+          unusedSeries: 100,
         },
       ]);
     });