- Child windows are added and removed dynamically from the window hierarchy when they're shown/hidden. Adding a hidden child window to a visible
parent is fine, but adding a hidden child window to a hidden parent will cause the child to show when the parent window is shown as it's still a part of
the window hierarchy.
- For some reason, not adding the child window to the parent entirely causes the child to not focus correctly the first time it's shown. Adding then immediately
calling orderOut to remove the child window from the hierarchy does work correctly so we do this to work around the weird issue.
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