Move resizing out of Window.focus, and into Window.init_for_scene (#2274)

Author: 3b1b

manimlib/window.py

@@ -69,7 +69,8 @@ def init_for_scene(self, scene: Scene):
         mglw.activate_context(window=self, ctx=self.ctx)
         self.timer.start()
 
-        self.focus()
+        # This line seems to resync the viewport
+        self.on_resize(*self.size)
 
     def get_monitor(self, index):
         try:
@@ -106,8 +107,6 @@ def focus(self):
         """
         self._window.set_visible(False)
         self._window.set_visible(True)
-        # This line seems to resync the viewport
-        self.on_resize(*self.size)
 
     def to_default_position(self):
         self.position = self.default_position