When in the tree grid are pinned columns and scroll horizontal the cells text is over the pinned text

[nrobakova]

Description

When in the tree grid are pinned columns and scroll horizontal the cells text is over the pinned text

• igniteui-angular version: 6.2.x 7.0.x
• browser: N/A

Steps to reproduce

1. Open dev sample treeGrid
2. Expand row ANATR
3. Scroll horizontal

Result

The cells text is over the pinned text.

Expected result

Scrolling should not change pinned column text

Attachments

Attach a sample if available, and screenshots, if applicable.

[DiyanDimitrov]

This issue is probably a design issue since the selected cell background is semi-transparent. Note that this is not specific to the tree grid, it is reproducible for a normal grid too.