cocoa-cb: move macOS option retrieval to the earliest point possible

moved the retrieval of the macOS specific options from the backend
initialisation to the initialisation of the CocoaCB class, the earliest
point possible. this way macOS specific options can be used for the
opengl context creation for example.

osdep/macOS_mpv_helper.swift

@@ -45,6 +45,12 @@ class MPVHelper: NSObject {
         mpctx = UnsafeMutablePointer<MPContext>(mp_client_get_core(mpvHandle))
         inputContext = mpctx!.pointee.input
 
+        if let app = NSApp as? Application {
+            let ptr = mp_get_config_group(mpctx!, mp_client_get_global(mpvHandle),
+                                          app.getMacOSConf())
+            macOpts = UnsafeMutablePointer<macos_opts>(OpaquePointer(ptr))!.pointee
+        }
+
         mpv_observe_property(mpvHandle, 0, "ontop", MPV_FORMAT_FLAG)
         mpv_observe_property(mpvHandle, 0, "border", MPV_FORMAT_FLAG)
         mpv_observe_property(mpvHandle, 0, "keepaspect-window", MPV_FORMAT_FLAG)

video/out/cocoa_cb_common.swift

@@ -61,12 +61,6 @@ class CocoaCB: NSObject {
         if backendState == .uninitialized {
             backendState = .needsInit
 
-            if let app = NSApp as? Application {
-                let ptr = mp_get_config_group(mpv.mpctx!, vo.pointee.global,
-                                              app.getMacOSConf())
-                mpv.macOpts = UnsafeMutablePointer<macos_opts>(OpaquePointer(ptr))!.pointee
-            }
-
             view = EventsView(cocoaCB: self)
             view.layer = layer
             view.wantsLayer = true