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display->removed
display ->removed:
Mark the display as hotplug-removed and move its frames to the display the window system reports for their window, or else to display_manager<-primary. The display is freed when it has no frames left. If it was the last display it is kept as a parking place: frames stay on it and new frames open on it, so @display does not fail. When a monitor is attached again, the frames move to it and the parked display is freed.
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