mac: add support for --auto-window-resize option

Fixes #9325

DOCS/man/options.rst

@@ -3400,7 +3400,6 @@ Window
     be the default behavior. Currently only affects X11 and SDL VOs.
 
 ``--auto-window-resize=<yes|no>``
-    (Wayland, Win32, and X11)
     By default, mpv will automatically resize itself if the video's size changes
     (i.e. advancing forward in a playlist). Setting this to ``no`` disables this
     behavior so the window size never changes automatically. This option does

video/out/cocoa_cb_common.swift

@@ -64,7 +64,7 @@ class CocoaCB: Common {
         mpv?.vo = vo
         if backendState == .needsInit {
             DispatchQueue.main.sync { self.initBackend(vo) }
-        } else {
+        } else if mpv?.opts.auto_window_resize ?? true {
             DispatchQueue.main.async {
                 self.updateWindowSize(vo)
                 self.layer?.update(force: true)

video/out/mac_common.swift

@@ -58,7 +58,9 @@ class MacCommon: Common {
                 initWindowState()
             }
 
-            if !NSEqualSizes(window?.unfsContentFramePixel.size ?? NSZeroSize, wr.size) {
+            if !NSEqualSizes(window?.unfsContentFramePixel.size ?? NSZeroSize, wr.size) &&
+               mpv?.opts.auto_window_resize ?? true
+            {
                 window?.updateSize(wr.size)
             }