Merge pull request #3422 from IgniteUI/ikitanov/fix-3419-vNext

Adding missing import for IgxIconModule to GridCollapsibleColumnGroups sample

Author: teodosiah

live-editing/configs/GridConfigGenerator.ts

@@ -1071,9 +1071,9 @@ export class GridConfigGenerator implements IConfigGenerator {
             component: 'GridCollapsibleColumnGroupsComponent',
             additionalFiles: ['/src/app/directives/prevent-scroll.directive.ts', '/src/app/data/invoiceData.ts'],
             appModuleConfig: new AppModuleConfig({
-                imports: ['GridCollapsibleColumnGroupsComponent', 'IgxGridModule', 'IgxTooltipModule', 'IgxPreventDocumentScrollModule'],
+                imports: ['GridCollapsibleColumnGroupsComponent', 'IgxGridModule', 'IgxTooltipModule', 'IgxPreventDocumentScrollModule', 'IgxIconModule'],
                 ngDeclarations: ['GridCollapsibleColumnGroupsComponent'],
-                ngImports: ['IgxPreventDocumentScrollModule', 'IgxGridModule', 'IgxTooltipModule']
+                ngImports: ['IgxPreventDocumentScrollModule', 'IgxGridModule', 'IgxTooltipModule', 'IgxIconModule']
             })
         }));