fix: don't show floating windows + efficiencies

alt-tab-macos/api-wrappers/AXUIElement.swift

@@ -15,13 +15,15 @@ extension AXUIElement {
     }
 
     func isActualWindow(_ isAppHidden: Bool = false) -> Bool {
-        // TODO: should we displays windows that disappear when invoking Expose? (e.g. Outlook meeting reminder window) (see https://stackoverflow.com/a/49723037/2249756)
         // TODO: TotalFinder and XtraFinder double-window hacks (see #84)
-        // TODO: should we display menubar windows? (e.g. iStats Pro dropdown menu)
         // Some non-windows have subrole: nil (e.g. some OS elements), "AXUnknown" (e.g. Bartender), "AXSystemDialog" (e.g. Intellij tooltips)
         // Some non-windows have title: nil (e.g. some OS elements)
         // Minimized windows or windows of a hidden app have subrole "AXDialog"
-        return title() != nil && (subrole() == "AXStandardWindow" || isMinimized() || isAppHidden)
+        return title() != nil && (subrole() == "AXStandardWindow" || isMinimized() || isAppHidden) && isOnNormalLevel()
+    }
+
+    func isOnNormalLevel() -> Bool {
+        return cgWindowId().level() == CGWindowLevelForKey(.normalWindow)
     }
 
     func title() -> String? {

alt-tab-macos/api-wrappers/CGWindowID.swift

@@ -6,6 +6,16 @@ extension CGWindowID {
         return cgProperty("kCGSWindowTitle", String.self)
     }
 
+    func level() -> CGWindowLevel {
+        var level = CGWindowLevel(0)
+        CGSGetWindowLevel(cgsMainConnectionId, self, &level)
+        return level
+    }
+
+    func spaces() -> [CGSSpaceID] {
+        return CGSCopySpacesForWindows(cgsMainConnectionId, CGSSpaceMask.all.rawValue, [self] as CFArray) as! [CGSSpaceID]
+    }
+
     func screenshot() -> CGImage? {
         // CGSHWCaptureWindowList
         var windowId_ = self

alt-tab-macos/api-wrappers/PrivateApis.swift

@@ -123,6 +123,11 @@ enum CGSSpaceMask: Int {
 @_silgen_name("CGSCopySpacesForWindows")
 func CGSCopySpacesForWindows(_ cid: CGSConnectionID, _ mask: CGSSpaceMask.RawValue, _ wids: CFArray) -> CFArray
 
+// returns window level (see definition in CGWindowLevel.h) of provided window
+// * macOS 10.10+
+@_silgen_name("CGSGetWindowLevel") @discardableResult
+func CGSGetWindowLevel(_ cid: CGSConnectionID, _ wid: CGWindowID, _ level: inout CGWindowLevel) -> CGError
+
 
 
 // ------------------------------------------------------------
@@ -151,11 +156,6 @@ func CGSCopySpacesForWindows(_ cid: CGSConnectionID, _ mask: CGSSpaceMask.RawVal
 //@_silgen_name("CGSGetWindowType") @discardableResult
 //func CGSGetWindowType(_ wid: CGWindowID, _ type: inout UInt32) -> CGError
 //
-//// seems to always return 0, for windows in the same space, other space, minimized, etc
-//// * macOS 10.10+
-//@_silgen_name("CGSGetWindowLevel") @discardableResult
-//func CGSGetWindowLevel(_ cid: CGSConnectionID, _ wid: CGWindowID, _ level: inout UInt32) -> CGError
-//
 //// * macOS 10.12+
 //@_silgen_name("CGSProcessAssignToSpace") @discardableResult
 //func CGSProcessAssignToSpace(_ cid: CGSConnectionID, _ pid: pid_t, _ sid: CGSSpaceID) -> CGError

alt-tab-macos/logic/Application.swift

@@ -115,7 +115,6 @@ private func eventWindowCreated(_ app: App, _ element: AXUIElement, _ applicatio
 
 private func eventFocusedWindowChanged(_ app: App, _ element: AXUIElement) {
     guard !app.appIsBeingUsed,
-          element.isActualWindow(),
           let existingIndex = Windows.list.firstIndexThatMatches(element) else { return }
     Windows.list.insert(Windows.list.remove(at: existingIndex), at: 0)
 }

alt-tab-macos/logic/Window.swift

@@ -129,8 +129,7 @@ private func eventWindowMiniaturizedOrDeminiaturized(_ app: App, _ element: AXUI
 }
 
 private func eventWindowTitleChanged(_ app: App, _ element: AXUIElement) {
-    guard element.isActualWindow(),
-          let window = Windows.list.firstWindowThatMatches(element),
+    guard let window = Windows.list.firstWindowThatMatches(element),
           let newTitle = window.axUiElement.title(),
           newTitle != window.title else { return }
     window.title = newTitle

alt-tab-macos/logic/Windows.swift

@@ -28,7 +28,7 @@ class Windows {
     static func updateSpaces() {
         let spacesMap = Spaces.allIdsAndIndexes()
         for window in list {
-            let spaceIds = CGSCopySpacesForWindows(cgsMainConnectionId, CGSSpaceMask.all.rawValue, [window.cgWindowId] as CFArray) as! [CGSSpaceID]
+            let spaceIds = window.cgWindowId.spaces()
             guard spaceIds.count > 0 else { continue }
             if spaceIds.count > 1 {
                 window.spaceId = Spaces.currentSpaceId