Merge branch 'master' into SIvanova/IE11-fix-dialog-sizing

Author: simeonoff

projects/igniteui-angular/src/lib/core/styles/components/grid/_excel-filtering-theme.scss

@@ -51,7 +51,11 @@
 
     %grid-excel-icon--filtered {
         &.igx-icon {
-            color: igx-color($palette, 'secondary');
+            color: if(
+                $variant == 'indigo-design',
+                igx-color($palette, 'warn', 500),
+                igx-color($palette, 'secondary')
+            );
         }
     }
 

projects/igniteui-angular/src/lib/grids/grid/public_api.ts

@@ -5,3 +5,4 @@ export * from './grid.directives';
 export * from './grid.module';
 export * from './grid-api.service';
 export * from './grid-row.component';
+export * from './expandable-cell.component';