Open multiple tooltips with keyboard and mouse

[jarekdanielak]

Describe the Bug

You can open more then one tooltip by using both keyboard and mouse navigation.

Found in #399 (review)

Steps to Reproduce

1. Open a tooltip by navigating properties panel with tab key.
2. Hover other another tooltip source.
3. Now you see 2 tooltips open.

Expected Behavior

Only one tooltip open at a time.

Environment

• Host (Browser/Node version), if applicable: [e.g. MS Edge 18, Chrome 69, Node 10 LTS]
• OS: [e.g. Windows 7]
• Library version: [e.g. 2.0.0]