BarGauge: throw W2104 if there is no place for render legend (T1307508) (#31115)

Author: pharret31

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

@@ -475,6 +475,9 @@ 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/js/__internal/viz/utils.ts

@@ -80,11 +80,7 @@ export let prepareSegmentRectPoints = function (left, top, width, height, border
   return { points, pathType: visiblyOpt === 15 ? 'area' : 'line' };
 };
 
-export {
-  refreshPaths,
-};
-
-export const areCanvasesDifferent = function (canvas1, canvas2) {
+const areCanvasesDifferent = function (canvas1, canvas2) {
   const sizeChangingThreshold = 1;
 
   const sizeLessThreshold = ['width', 'height']
@@ -95,14 +91,20 @@ export const areCanvasesDifferent = function (canvas1, canvas2) {
   return !(sizeLessThreshold && canvasCoordsIsEqual);
 };
 
-export const floorCanvasDimensions = function (canvas) {
+const floorCanvasDimensions = function (canvas) {
   return {
     ...canvas,
     height: floor(canvas.height),
     width: floor(canvas.width),
   };
 };
 
+export {
+  areCanvasesDifferent,
+  floorCanvasDimensions,
+  refreshPaths,
+};
+
 /// #DEBUG
 exports._test_prepareSegmentRectPoints = function () {
   // @ts-expect-error

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

@@ -345,6 +345,15 @@ 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) {