BarGauge: throw W2104 if there is no place for render legend (T1307508) (#31116)

Author: pharret31

packages/devextreme/js/viz/gauges/bar_gauge.js

@@ -435,6 +435,9 @@ export const dxBarGauge = BaseGauge.inherit({
         const that = this;
         const options = that._options.silent();
 
+        const legendOptions = that._themeManager.theme('legend');
+        legendOptions._incidentOccurred = that._incidentOccurred;
+
         that._palette = that._themeManager.createPalette(options.palette, {
             useHighlight: true,
             extensionMode: options.paletteExtensionMode

packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge_new.tests.js

@@ -339,6 +339,15 @@ QUnit.test('Legend update should call trigger core content rerender', function(a
     assert.strictEqual(gauge.renderCount, initialRenderCount + 1);
 });
 
+QUnit.test('gauge legend should have the same reference to _incidentOccurred as gauge itself (T1307508)', function(assert) {
+    const gauge = this.createGauge({});
+
+    const gaugeIncidentOccurred = gauge._incidentOccurred;
+    const legendIncidentOccurred = gauge._themeManager.theme('legend')._incidentOccurred;
+
+    assert.strictEqual(gaugeIncidentOccurred, legendIncidentOccurred, 'functions are the same');
+});
+
 QUnit.module('Center Template', environment);
 
 QUnit.test('Should create group for center template on widget creating', function(assert) {