The red text and red icon is a HBoxContainer. Sometimes the HBoxContainer is normally hidden. It's the error bar/panel here:
When it is shown the parent VBoxContainer expands, when it is hidden the VBoxContainer contracts. But...
Because this special HBoxContainer needs to appear in many places, I moved this HBoxContainer into its own scene, (let's call it the "Error Bar Scene"). Inside it has code to set itself visible = false or visible = true.
Now when this new scene grows, the VBoxContainer does expand, but when it shrinks itself it doesn't contract the parent VBoxContainer.
What do I need to do to make it so when a scene wants to hide itself, it tells the parent scene that it updated its size?
export var failure_message_timeout = 4
$FailedPanel.visible = false
self.visible = false
$FailedPanel.visible = true
self.visible = true
$FailedPanel/Label.text = message
$HideTimer.wait_time = failure_message_timeout