```
The sequence show -> raise -> activateWindow is factored out to the new
function GUIUtil::bringToFront where a macOS fix is added in order to
fix #13829.
```
Partial backport of core PR14123 (commit )
https://github.com/bitcoin/bitcoin/pull/14123/commits/5796671e1dd8a2d0b1e750c2dce19a10af624095
Depends on D4481.