mac: add an option to prevent focusing of the window on open

on macOS 10.15 setting the activation policy behaves quite weirdly. the
call changes the current active App to a nameless process, which
probably also the reason that prevents the not focusing to work.
a workaround for that, is to refocus the previous active app.

Fixes #7725

DOCS/man/options.rst

@@ -2949,6 +2949,11 @@ Window
     :desktop: On top of the Dekstop behind windows and Desktop icons.
     :level:   A level as integer.
 
+``--focus-on-open``, ``--no-focus-on-open``
+    (macOS only)
+    Focus the video window on creation and makes it the front most window. This
+    is on by default.
+
 ``--border``, ``--no-border``
     Play video with window border and decorations. Since this is on by
     default, use ``--no-border`` to disable the standard window decorations.

options/options.c

@@ -121,6 +121,7 @@ static const m_option_t mp_vo_opt_list[] = {
     {"window-scale", OPT_DOUBLE(window_scale), M_RANGE(0.001, 100)},
     {"window-minimized", OPT_FLAG(window_minimized)},
     {"window-maximized", OPT_FLAG(window_maximized)},
+    {"focus-on-open", OPT_BOOL(focus_on_open)},
     {"force-window-position", OPT_FLAG(force_window_position)},
     {"x11-name", OPT_STRING(winname)},
     {"wayland-app-id", OPT_STRING(appid)},
@@ -199,6 +200,7 @@ const struct m_sub_options vo_sub_opts = {
         .ontop_level = -1,
         .timing_offset = 0.050,
         .swapchain_depth = 3,
+        .focus_on_open = true,
     },
 };
 

options/options.h

@@ -19,6 +19,7 @@ typedef struct mp_vo_opts {
     int all_workspaces;
     int window_minimized;
     int window_maximized;
+    bool focus_on_open;
 
     int screen_id;
     int fsscreen_id;

video/out/cocoa_cb_common.swift

@@ -73,8 +73,9 @@ class CocoaCB: Common {
     }
 
     func initBackend(_ vo: UnsafeMutablePointer<vo>) {
+        let previousActiveApp = getActiveApp()
         initApp()
-        initWindow(vo)
+        initWindow(vo, previousActiveApp)
         updateICCProfile()
         initWindowState()
 

video/out/mac/common.swift

@@ -82,7 +82,7 @@ class Common: NSObject {
         setAppIcon()
     }
 
-    func initWindow(_ vo: UnsafeMutablePointer<vo>) {
+    func initWindow(_ vo: UnsafeMutablePointer<vo>, _ previousActiveApp: NSRunningApplication?) {
         let (mpv, targetScreen, wr) = getInitProperties(vo)
 
         guard let view = self.view else {
@@ -115,7 +115,12 @@ class Common: NSObject {
             window.orderFront(nil)
         }
 
-        NSApp.activate(ignoringOtherApps: true)
+        NSApp.activate(ignoringOtherApps: mpv.opts.focus_on_open)
+
+        // workaround for macOS 10.15 to refocus the previous App
+        if (!mpv.opts.focus_on_open) {
+            previousActiveApp?.activate(options: .activateAllWindows)
+        }
     }
 
     func initView(_ vo: UnsafeMutablePointer<vo>, _ layer: CALayer) {
@@ -419,6 +424,11 @@ class Common: NSObject {
         return (mpv, targetScreen, wr)
     }
 
+    // call before initApp, because on macOS +10.15 it changes the active App
+    func getActiveApp() -> NSRunningApplication? {
+        return NSWorkspace.shared.runningApplications.first(where: {$0.isActive})
+    }
+
     func flagEvents(_ ev: Int) {
         eventsLock.lock()
         events |= ev