BUG: CSS Properties are not correctly loaded if style manager panel is not active at initialization

Hi @artf!

Let me describe the issue

Version:

16.22

What is the expected behavior? The css property values and visibility settings should take the correct configuration Describe the bug detailed If the style manager is not active on editor load, when you click on an element and open the style properties, they are not updated.

Steps to reproduce

1 - Make the style manager panel view not active by default 2 - Make any css property in a component unstylable, In this example, the text component css 'display' property is unstylable 3 - When you click and open the styles view of the component, the display property is present <img width="1305" alt="image" src="https://user-images.githubusercontent.com/1976679/92250339-a4ddea00-eecb-11ea-8178-a7980db90642.png"> 4 - Click on any other component and go back to the style settings of the text, the display will not be visible. <img width="727" alt="image" src="https://user-images.githubusercontent.com/1976679/92250476-d060d480-eecb-11ea-8fd2-47b425361c61.png">

This is related to the propertyView method targetUpdated not being fired the first time the style manager loads if its panel is not active at the initialization process, I've tried to find a fix for this but i need some guidance here.

This not only affects the visibility but also the values are not correctly displayed.

Let me know what you think,

Thanks!