fix: label overlap when legend deselected (#7215)

* fix: overlapDodgeY transform issue when filtered data is empty

* chore: restore playground

* test: update snapshots

* test: add test

Author: interstellarmt

__tests__/integration/snapshots/interaction/change-size-polar-crosshairs-x-y-no-elements/step3.svg

@@ -92,3 +92,4 @@ export { stateAgesSankeyHighlight } from './stateages-sankey-highlight';
 export { stocksLineSliderWheel } from './stocks-line-slider-wheel';
 export { aaplLineSliderWheel } from './aapl-line-slider-wheel';
 export { intervalSliderWheelTranspose } from './interval-slider-wheel-transpose';
+export { stocksLineLabelOverlapDodgeYLegendFilter } from './stocks-line-label-overlap-dodge-y-legend-filter';

__tests__/integration/snapshots/interaction/stocks-line-label-overlap-dodge-y-legend-filter/step0.svg

@@ -0,0 +1,44 @@
+import { G2Spec } from '../../../src';
+import { LEGEND_ITEMS_CLASS_NAME } from '../../../src/interaction/legendFilter';
+import { step } from './utils';
+
+export function stocksLineLabelOverlapDodgeYLegendFilter(): G2Spec {
+  return {
+    type: 'line',
+    data: {
+      type: 'fetch',
+      value: 'data/stocks2.csv',
+    },
+    encode: {
+      x: (d) => new Date(d.date).getFullYear(),
+      y: 'price',
+      color: 'symbol',
+    },
+    transform: [{ type: 'groupX', y: 'mean' }],
+    labels: [
+      {
+        text: 'price',
+        transform: [{ type: 'overlapDodgeY' }],
+        fontSize: 10,
+      },
+    ],
+    legend: {
+      color: {
+        defaultSelect: [],
+      },
+    },
+  };
+}
+
+stocksLineLabelOverlapDodgeYLegendFilter.steps = ({ canvas }) => {
+  const { document } = canvas;
+  const elements = document.getElementsByClassName(LEGEND_ITEMS_CLASS_NAME);
+  const [e0, e1, e2] = elements;
+  return [
+    // Step 0: Initial state - all deselected (defaultSelect: [])
+    step(e0, 'click'), // Step 1: Select first item
+    step(e1, 'click'), // Step 2: Select second item
+    step(e0, 'click'), // Step 3: Deselect first, only second selected
+    step(e1, 'click'), // Step 4: Deselect second, back to all deselected
+  ];
+};