macOS Event Loop / Focus Bug

[lemarier]

Describe the bug
This is the main issue to track all bugs related to the macOS Event Loop / Focus weird behaviors.

To resume the looks like the event loop is not working great with the focus.

On the first draw, the activation hack seems to disable some elements and makes the window unusable.

We also lost the focus on the Window / Webview causing different problems.

Steps To Reproduce
N/A

Expected behavior
Should work exactly like a native window.

Screenshots
N/A

Platform and Versions (please complete the following information):
OS: macOS

Additional context
Please refer to linked issues.

[wusyong]

Closed by #220