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import AppKit
extension NSWindow {
/// Get the CGWindowID type for the window (used for low level CoreGraphics APIs).
var cgWindowId: CGWindowID? {
// "If the window doesn’t have a window device, the value of this
// property is equal to or less than 0." - Docs. In practice I've
// found this is true if a window is not visible.
guard windowNumber > 0 else { return nil }
return CGWindowID(windowNumber)
}
/// True if this is the first window in the tab group.
var isFirstWindowInTabGroup: Bool {
guard let firstWindow = tabGroup?.windows.first else { return true }
return firstWindow === self
}
}
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