Keyboard navigation issues

[sstoyanovIG]

Description

Keyboard navigation issues

• igniteui-angular version: 6.2.x
• browser: all

Steps to reproduce

1. Open Grid Moving sample, select the first cell and hold ‘shift + tab’ ; the focus should not propagate to checkbox inside grid header;
2. Open Grid Moving sample, start apply filtering over some column; ‘tab’ to the ‘Cancel’ button, press ‘shift + tab’ - the focus should be moved to the previous button.
3. Open Grid Moving sample, start apply filtering over some column - when reset button is disabled should not be able to focus it with ‘tab’ and ‘shift + tab’
4. Open Grid Moving sample, filter the column 'Phone'; select the first cell in the grid; press ‘shift + tab’; notice that when the focus is on the chip inside "Phone" column and press ‘shift + tab’ again scroll is performed and the focus remains over the chip;