Galina Edinakova

Implement tests for multiple files upload in a single XHR ### Expected result Automation coverage should be %90+.

## Description An exception is thrown on loading the demo. * igniteui-angular version: 17.1 * browser: N/A ## Steps to reproduce 1. Run dev demos 2. Navigate to "Grid Selection"...

* igniteui-angular version: 16.1, 17.0, 17.1 * browser: N/A ## Steps to reproduce 1. Run dev demos 2. Navigate to "Hierarchical Grid" demo 3. Type "Pro" in the search box...

### Description Certain styling demos, which are now marked with a note, stating they won't be affected when changing the theme, actually are affected and the result is not good....

_Estimated Delivery Sprint - Sprint X_ - [x] Research - [ ] Specification - https://github.com/IgniteUI/igniteui-webcomponents/wiki/Tile-Manager-Specification - [ ] Component and tests implementation - [ ] API Documentation - [ ]...