feat: add preference: show standard tabs as windows

src/logic/Preferences.swift

@@ -24,6 +24,7 @@ class Preferences {
         "mouseHoverEnabled": "true",
         "showMinimizedWindows": "true",
         "showHiddenWindows": "true",
+        "showTabsAsWindows": "false",
         "windowDisplayDelay": "0",
         "theme": "0",
         "showOnScreen": "0",
@@ -63,6 +64,7 @@ class Preferences {
     static var mouseHoverEnabled: Bool { defaults.bool("mouseHoverEnabled") }
     static var showMinimizedWindows: Bool { defaults.bool("showMinimizedWindows") }
     static var showHiddenWindows: Bool { defaults.bool("showHiddenWindows") }
+    static var showTabsAsWindows: Bool { defaults.bool("showTabsAsWindows") }
     static var windowDisplayDelay: DispatchTimeInterval { DispatchTimeInterval.milliseconds(defaults.int("windowDisplayDelay")) }
     static var hideSpaceNumberLabels: Bool { defaults.bool("hideSpaceNumberLabels") }
     static var startAtLogin: Bool { defaults.bool("startAtLogin") }

src/logic/Windows.swift

@@ -100,7 +100,7 @@ class Windows {
             !(Preferences.appsToShow == .active && window.application.runningApplication != NSWorkspace.shared.frontmostApplication) &&
             !(Preferences.spacesToShow == .active && window.spaceId != Spaces.currentSpaceId) &&
             !(Preferences.screensToShow == .showingAltTab && !isOnScreen(window, screen)) &&
-            !isTabbed(window)
+            (Preferences.showTabsAsWindows || !isTabbed(window))
     }
 
     static func isTabbed(_ window: Window) -> Bool {

src/ui/preferences-window/tabs/AppearanceTab.swift

@@ -19,6 +19,7 @@ class AppearanceTab: NSViewController, PreferencePane {
             LabelAndControl.makeLabelWithDropdown(NSLocalizedString("Show on:", comment: ""), "showOnScreen", ShowOnScreenPreference.allCases),
             LabelAndControl.makeLabelWithSlider(NSLocalizedString("Apparition delay:", comment: ""), "windowDisplayDelay", 0, 2000, 11, false, "ms"),
             LabelAndControl.makeLabelWithCheckbox(NSLocalizedString("Hide space number labels:", comment: ""), "hideSpaceNumberLabels"),
+            LabelAndControl.makeLabelWithCheckbox(NSLocalizedString("Show standard tabs as windows:", comment: ""), "showTabsAsWindows"),
         ])
         grid.column(at: 0).xPlacement = .trailing
         grid.rowAlignment = .lastBaseline