fix: closing alttab windows gives focus to previous app (closes #3577)

src/api-wrappers/HelperExtensions.swift

@@ -189,3 +189,11 @@ extension Optional where Wrapped == String {
         return (self ?? "").localizedStandardCompare(string ?? "")
     }
 }
+
+extension NSWindow {
+    func hideAppIfLastWindowIsClosed() {
+        if (!NSApp.windows.contains { $0.isVisible && $0.className != "NSStatusBarWindow" && $0.windowNumber != windowNumber}) {
+            App.shared.hide(nil)
+        }
+    }
+}

src/ui/FeedbackWindow.swift

@@ -125,4 +125,9 @@ class FeedbackWindow: NSWindow {
         }
         return result
     }
+
+    override func close() {
+        hideAppIfLastWindowIsClosed()
+        super.close()
+    }
 }

src/ui/preferences-window/PreferencesWindow.swift

@@ -96,4 +96,9 @@ class PreferencesWindow: NSWindow, NSToolbarDelegate {
     func toolbarSelectableItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] {
         return Array(toolbarItems.keys)
     }
+
+    override func close() {
+        hideAppIfLastWindowIsClosed()
+        super.close()
+    }
 }