Horizontal splitter collapse button cannot be clicked when hovered

[Diyan Dimitrov]

Description

Horizontal splitter collapse button cannot be clicked when hovered.

Steps to reproduce

1. Open https://www.igniteui.com/splitter/basic-horizontal-splitter
2. Hover the mouse over the splitter and move the cursor over the collapse button.

Result

Sometimes the collapse button cannot be clicked when the mouse is over it and the mouse cursor is not correct (it shows resizing instead of hand).

Expected result

The collapse button should be clickable when it is hovered.