[tui] Changed TUI animation frame caching criteria

- Change: Caching of animated image frames in the TUI is now based on image file size instead of frame count.

NOTE: This change is temporary and will be reverted as soon as a Pillow version including the improvements in python-pillow/Pillow#6077 is released.

term_img/tui/main.py

@@ -90,7 +90,12 @@ def next_frame(*_) -> None:
                 del image._forced_anim_size_hash
 
     frame_duration = FRAME_DURATION or image._image._frame_duration
-    image._animator = ImageIterator(image._image, -1, f"1.1{image._alpha}")._animator
+    image._animator = ImageIterator(
+        image._image,
+        -1,
+        f"1.1{image._alpha}",
+        os.stat(image._image._source).st_size <= 2097152,
+    )._animator
 
     # `Image.render()` checks for this. It has to be set here since `ImageIterator`
     # doesn't set it until the first `next()` is called.