Chart: fix auto breaks calculation when there are duplicated and high-precision values (T1256385) (#29108)

Author: anna-shakhova

packages/devextreme/js/viz/axes/xy_axes.js

@@ -204,7 +204,9 @@ function generateAutoBreaks({ logarithmBase, type, maxAutoBreakCount }, series,
 
     let minDiff = RANGE_RATIO * visibleRange;
 
-    const ranges = generateRangesOnPoints(sortedAllPoints, edgePoints, getRange).sort((a, b) => b.length - a.length);
+    const ranges = generateRangesOnPoints(sortedAllPoints, edgePoints, getRange)
+        .filter(({ length }) => !!length)
+        .sort((a, b) => b.length - a.length);
     const epsilon = _math.min.apply(null, ranges.map(r => r.length)) / 1000;
     const _maxAutoBreakCount = isDefined(maxAutoBreakCount) ? _math.min(maxAutoBreakCount, ranges.length) : ranges.length;
 

packages/devextreme/testing/tests/DevExpress.viz.core/xyAxes.tests.js

@@ -4150,6 +4150,26 @@ QUnit.test('Option maxCountOfBreaks is undefined', function(assert) {
     ]);
 });
 
+QUnit.test('Breaks generated correctly for float values, maxCountOfBreaks is default (T1256385)', function(assert) {
+    const min = 0;
+    const max = 426.2648;
+    this.series = [
+        this.stubSeries([[max, 55.6356, 6.1606, 0.6016, min, min, min], []]),
+    ];
+    this.axis.setGroupSeries(this.series);
+
+    this.options.maxAutoBreakCount = 4;
+    this.updateOptions({ autoBreaksEnabled: true });
+    this.axis.setBusinessRange({ min, max });
+
+    this.axis.createTicks(this.canvas);
+
+    const breaks = this.tickGeneratorSpy.lastCall.args[7];
+    const spacing = breaks.reduce((prev, item) => prev + (item.to - item.from), 0);
+
+    assert.notEqual(spacing, max - min, 'Generated breaks length sum does not equal to business range');
+});
+
 QUnit.test('Logarithmic axis', function(assert) {
     this.series = [
         this.stubSeries([[0.1, 1, 10, 100, 1000, 10000000], []])