Restore --save_last_frame functionality

Author: eulertour

manim/renderer/cairo_renderer.py

@@ -208,8 +208,9 @@ def revert_to_original_skipping_status(self):
             file_writer_config["skip_animations"] = self.original_skipping_status
         return self
 
-    def finish(self):
+    def finish(self, scene):
         file_writer_config["skip_animations"] = False
         self.file_writer.finish()
         if file_writer_config["save_last_frame"]:
+            self.update_frame(scene, ignore_skipping=True)
             self.file_writer.save_final_image(self.camera.get_image())

manim/scene/scene.py

@@ -89,7 +89,7 @@ def render(self):
         except EndSceneEarlyException:
             pass
         self.tear_down()
-        self.renderer.finish()
+        self.renderer.finish(self)
         logger.info(
             f"Rendered {str(self)}\nPlayed {self.renderer.num_plays} animations"
         )