We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Repeated looping over image stack shows last frame in place of first frame
When looping through the frames in an animation or TIFF stack with `ImageSequence.Iterator`, the frame pointer is not reset for the first frame. Consequently, if the loop is run through a second time the final frame is shown again instead of the first frame.
### Demo

Code

``` python
from PIL import Image, ImageSequence
import os
# Make a test image
os.system((
    "convert -depth 8 -size 1x1 xc:'rgb(100,100,100)' xc:'rgb(121,121,121)'"
    " xc:'rgb(142,142,142)' xc:'rgb(163,163,163)' image.tif"
))
# Open the image
im = Image.open('image.tif')
# Run through the image
print('First run')
for frame in ImageSequence.Iterator(im):
    print(list(frame.getdata()))
# Run through the image again
print('Second run')
for frame in ImageSequence.Iterator(im):
    print(list(frame.getdata()))
```

Output

```
First run
[100]
[121]
[142]
[163]
Second run
[163]
[121]
[142]
[163]
```


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `PIL/ImageSequence.py`
Content:
```
1 #
2 # The Python Imaging Library.
3 # $Id$
4 #
5 # sequence support classes
6 #
7 # history:
8 # 1997-02-20 fl     Created
9 #
10 # Copyright (c) 1997 by Secret Labs AB.
11 # Copyright (c) 1997 by Fredrik Lundh.
12 #
13 # See the README file for information on usage and redistribution.
14 #
15 
16 ##
17 
18 
19 class Iterator(object):
20     """
21     This class implements an iterator object that can be used to loop
22     over an image sequence.
23 
24     You can use the ``[]`` operator to access elements by index. This operator
25     will raise an :py:exc:`IndexError` if you try to access a nonexistent
26     frame.
27 
28     :param im: An image object.
29     """
30 
31     def __init__(self, im):
32         if not hasattr(im, "seek"):
33             raise AttributeError("im must have seek method")
34         self.im = im
35 
36     def __getitem__(self, ix):
37         try:
38             if ix:
39                 self.im.seek(ix)
40             return self.im
41         except EOFError:
42             raise IndexError  # end of sequence
43
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/PIL/ImageSequence.py b/PIL/ImageSequence.py
--- a/PIL/ImageSequence.py
+++ b/PIL/ImageSequence.py
@@ -35,8 +35,7 @@
 
     def __getitem__(self, ix):
         try:
-            if ix:
-                self.im.seek(ix)
+            self.im.seek(ix)
             return self.im
         except EOFError:
             raise IndexError  # end of sequence

{"golden_diff": "diff --git a/PIL/ImageSequence.py b/PIL/ImageSequence.py\n--- a/PIL/ImageSequence.py\n+++ b/PIL/ImageSequence.py\n@@ -35,8 +35,7 @@\n \n     def __getitem__(self, ix):\n         try:\n-            if ix:\n-                self.im.seek(ix)\n+            self.im.seek(ix)\n             return self.im\n         except EOFError:\n             raise IndexError  # end of sequence\n", "issue": "Repeated looping over image stack shows last frame in place of first frame\nWhen looping through the frames in an animation or TIFF stack with `ImageSequence.Iterator`, the frame pointer is not reset for the first frame. Consequently, if the loop is run through a second time the final frame is shown again instead of the first frame.\n### Demo\n\nCode\n\n``` python\nfrom PIL import Image, ImageSequence\nimport os\n# Make a test image\nos.system((\n    \"convert -depth 8 -size 1x1 xc:'rgb(100,100,100)' xc:'rgb(121,121,121)'\"\n    \" xc:'rgb(142,142,142)' xc:'rgb(163,163,163)' image.tif\"\n))\n# Open the image\nim = Image.open('image.tif')\n# Run through the image\nprint('First run')\nfor frame in ImageSequence.Iterator(im):\n    print(list(frame.getdata()))\n# Run through the image again\nprint('Second run')\nfor frame in ImageSequence.Iterator(im):\n    print(list(frame.getdata()))\n```\n\nOutput\n\n```\nFirst run\n[100]\n[121]\n[142]\n[163]\nSecond run\n[163]\n[121]\n[142]\n[163]\n```\n\n", "before_files": [{"content": "#\n# The Python Imaging Library.\n# $Id$\n#\n# sequence support classes\n#\n# history:\n# 1997-02-20 fl     Created\n#\n# Copyright (c) 1997 by Secret Labs AB.\n# Copyright (c) 1997 by Fredrik Lundh.\n#\n# See the README file for information on usage and redistribution.\n#\n\n##\n\n\nclass Iterator(object):\n    \"\"\"\n    This class implements an iterator object that can be used to loop\n    over an image sequence.\n\n    You can use the ``[]`` operator to access elements by index. This operator\n    will raise an :py:exc:`IndexError` if you try to access a nonexistent\n    frame.\n\n    :param im: An image object.\n    \"\"\"\n\n    def __init__(self, im):\n        if not hasattr(im, \"seek\"):\n            raise AttributeError(\"im must have seek method\")\n        self.im = im\n\n    def __getitem__(self, ix):\n        try:\n            if ix:\n                self.im.seek(ix)\n            return self.im\n        except EOFError:\n            raise IndexError  # end of sequence\n", "path": "PIL/ImageSequence.py"}], "after_files": [{"content": "#\n# The Python Imaging Library.\n# $Id$\n#\n# sequence support classes\n#\n# history:\n# 1997-02-20 fl     Created\n#\n# Copyright (c) 1997 by Secret Labs AB.\n# Copyright (c) 1997 by Fredrik Lundh.\n#\n# See the README file for information on usage and redistribution.\n#\n\n##\n\n\nclass Iterator(object):\n    \"\"\"\n    This class implements an iterator object that can be used to loop\n    over an image sequence.\n\n    You can use the ``[]`` operator to access elements by index. This operator\n    will raise an :py:exc:`IndexError` if you try to access a nonexistent\n    frame.\n\n    :param im: An image object.\n    \"\"\"\n\n    def __init__(self, im):\n        if not hasattr(im, \"seek\"):\n            raise AttributeError(\"im must have seek method\")\n        self.im = im\n\n    def __getitem__(self, ix):\n        try:\n            self.im.seek(ix)\n            return self.im\n        except EOFError:\n            raise IndexError  # end of sequence\n", "path": "PIL/ImageSequence.py"}]}