Add quick-terminal-space-behavior option

macos/Sources/Features/QuickTerminal/QuickTerminalSpaceBehavior.swift

@@ -0,0 +1,36 @@
+import Foundation
+import Cocoa
+
+enum QuickTerminalSpaceBehavior {
+    case remain
+    case move
+
+    init?(fromGhosttyConfig string: String) {
+        switch (string) {
+            case "move":
+                self = .move
+
+            case "remain":
+                self = .remain
+
+            default:
+                return nil
+        }
+    }
+
+    var collectionBehavior: NSWindow.CollectionBehavior {
+        let commonBehavior: [NSWindow.CollectionBehavior] = [
+            .ignoresCycle,
+            .fullScreenAuxiliary
+        ]
+
+        switch (self) {
+            case .move:
+                // We want this to be part of every space because it is a singleton.
+                return NSWindow.CollectionBehavior([.canJoinAllSpaces] + commonBehavior)
+            case .remain:
+                // We want this to move the window to the active space.
+                return NSWindow.CollectionBehavior([.moveToActiveSpace] + commonBehavior)
+        }
+    }
+}