prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  [ipython] File > Save Screenshot... warns about replacing if extension is provided
  ## 🐛 Bug
  
  If a napari viewer is launched from ipython and you use File > Save Screenshot... then everything works fine if you just enter a file name, **but if you specify the extension**—out of habit or to change the file format—then napari will warn that the file already exists, even if it does not.
  Regardless of choice, the file is created and everything works.
  
  Looking carefully, when one clicks Save the screen flashes, the file appears in the list in the dialog, and the warning pops up--the dialog remains up.
  It's like the file is created and then it tries a second time when it goes to close the dialog.
  
  Edit:
  On the other hand, *if you pass a filename that exists,* **but without extension**, it will correctly warn that the file exists, but if say `no` to overwriting, the dialog closes with: `WARNING: QDialog::exec: Recursive call detected`
  If you *do pass a full name with extension*, it will correctly warn that the file exists, and saying `no` will return you to the dialog to modify the name—as expected.
  
  ## To Reproduce
  
  Steps to reproduce the behavior:
  
  1. launch ipython and use 
  ```
  import napari
  viewer = napari.Viewer()
  ```
  3. open any sample image or add any layer
  4. File > Save Screenshot...
  5. enter a file name **with an extension** but make sure it's a unique name.
  
  ## Expected behavior
  
  No warning should be raised if the file doesn't exist, the dialog should just disappear and the file should be created.
  If the warning is raised and the user clicks `no` to not overwrite, the dialog should remain open so the user can change the name.
  
  ## Environment
  
  ```
  napari: 0.4.18
  Platform: macOS-13.4.1-arm64-arm-64bit
  System: MacOS 13.4.1
  Python: 3.10.12 | packaged by conda-forge | (main, Jun 23 2023, 22:41:52) [Clang 15.0.7 ]
  Qt: 5.15.6
  PyQt5: 5.15.7
  NumPy: 1.25.1
  SciPy: 1.11.1
  Dask: 2023.7.0
  VisPy: 0.12.2
  magicgui: 0.7.2
  superqt: unknown
  in-n-out: 0.1.8
  app-model: 0.2.0
  npe2: 0.7.0
  
  OpenGL:
  - GL version: 2.1 Metal - 83.1
  - MAX_TEXTURE_SIZE: 16384
  
  Screens:
  - screen 1: resolution 1800x1169, scale 2.0
  
  Settings path:
  - /Users/sobolp/Library/Application Support/napari/napari-418_d279d6cf5d4193876ed97858e757fe322037331b/settings.yaml
  
  ```
  
  ## Additional context
  
  Other dialogs, like Save Selected Layer work fine.
  Using the native dialog (when running napari from the command line) does not have this issue.
  
  </issue>
  <code>
  [start of napari/_qt/dialogs/screenshot_dialog.py]
  1 import os
  2 from pathlib import Path
  3 from typing import Any, Callable
  4 
  5 from qtpy.QtWidgets import QFileDialog, QMessageBox
  6 
  7 from napari.utils.misc import in_ipython
  8 from napari.utils.translations import trans
  9 
  10 HOME_DIRECTORY = str(Path.home())
  11 
  12 
  13 class ScreenshotDialog(QFileDialog):
  14     """
  15     Dialog to chose save location of screenshot.
  16 
  17     Parameters
  18     ----------
  19     save_function : Callable[[str], Any],
  20         Function to be called on success of selecting save location
  21      parent : QWidget, optional
  22         Optional parent widget for this widget..
  23     directory : str, optional
  24         Starting directory to be set to File Dialog
  25 
  26     """
  27 
  28     def __init__(
  29         self,
  30         save_function: Callable[[str], Any],
  31         parent=None,
  32         directory=HOME_DIRECTORY,
  33         history=None,
  34     ) -> None:
  35         super().__init__(parent, trans._("Save screenshot"))
  36         self.setAcceptMode(QFileDialog.AcceptSave)
  37         self.setFileMode(QFileDialog.AnyFile)
  38         self.setNameFilter(
  39             trans._("Image files (*.png *.bmp *.gif *.tif *.tiff)")
  40         )
  41         self.setDirectory(directory)
  42         self.setHistory(history)
  43 
  44         if in_ipython():
  45             self.setOptions(QFileDialog.DontUseNativeDialog)
  46 
  47         self.save_function = save_function
  48 
  49     def accept(self):
  50         save_path = self.selectedFiles()[0]
  51         if os.path.splitext(save_path)[1] == "":
  52             save_path = save_path + ".png"
  53             if os.path.exists(save_path):
  54                 res = QMessageBox().warning(
  55                     self,
  56                     trans._("Confirm overwrite"),
  57                     trans._(
  58                         "{save_path} already exists. Do you want to replace it?",
  59                         save_path=save_path,
  60                     ),
  61                     QMessageBox.Yes | QMessageBox.No,
  62                     QMessageBox.No,
  63                 )
  64                 if res != QMessageBox.Yes:
  65                     # standard accept return 1, reject 0. This inform that dialog should be reopened
  66                     super().accept()
  67                     self.exec_()
  68         self.save_function(save_path)
  69         return super().accept()
  70
  [end of napari/_qt/dialogs/screenshot_dialog.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/napari/_qt/dialogs/screenshot_dialog.py b/napari/_qt/dialogs/screenshot_dialog.py
  --- a/napari/_qt/dialogs/screenshot_dialog.py
  +++ b/napari/_qt/dialogs/screenshot_dialog.py
  @@ -62,8 +62,9 @@
                       QMessageBox.No,
                   )
                   if res != QMessageBox.Yes:
  -                    # standard accept return 1, reject 0. This inform that dialog should be reopened
  -                    super().accept()
  -                    self.exec_()
  -        self.save_function(save_path)
  -        return super().accept()
  +                    # return in this case since a valid name for the
  +                    # file is needed so the dialog needs to be visible
  +                    return
  +        super().accept()
  +        if self.result():
  +            self.save_function(save_path)
  
verification_info: {"golden_diff": "diff --git a/napari/_qt/dialogs/screenshot_dialog.py b/napari/_qt/dialogs/screenshot_dialog.py\n--- a/napari/_qt/dialogs/screenshot_dialog.py\n+++ b/napari/_qt/dialogs/screenshot_dialog.py\n@@ -62,8 +62,9 @@\n                     QMessageBox.No,\n                 )\n                 if res != QMessageBox.Yes:\n-                    # standard accept return 1, reject 0. This inform that dialog should be reopened\n-                    super().accept()\n-                    self.exec_()\n-        self.save_function(save_path)\n-        return super().accept()\n+                    # return in this case since a valid name for the\n+                    # file is needed so the dialog needs to be visible\n+                    return\n+        super().accept()\n+        if self.result():\n+            self.save_function(save_path)\n", "issue": "[ipython] File > Save Screenshot... warns about replacing if extension is provided\n## \ud83d\udc1b Bug\r\n\r\nIf a napari viewer is launched from ipython and you use File > Save Screenshot... then everything works fine if you just enter a file name, **but if you specify the extension**\u2014out of habit or to change the file format\u2014then napari will warn that the file already exists, even if it does not.\r\nRegardless of choice, the file is created and everything works.\r\n\r\nLooking carefully, when one clicks Save the screen flashes, the file appears in the list in the dialog, and the warning pops up--the dialog remains up.\r\nIt's like the file is created and then it tries a second time when it goes to close the dialog.\r\n\r\nEdit:\r\nOn the other hand, *if you pass a filename that exists,* **but without extension**, it will correctly warn that the file exists, but if say `no` to overwriting, the dialog closes with: `WARNING: QDialog::exec: Recursive call detected`\r\nIf you *do pass a full name with extension*, it will correctly warn that the file exists, and saying `no` will return you to the dialog to modify the name\u2014as expected.\r\n\r\n## To Reproduce\r\n\r\nSteps to reproduce the behavior:\r\n\r\n1. launch ipython and use \r\n```\r\nimport napari\r\nviewer = napari.Viewer()\r\n```\r\n3. open any sample image or add any layer\r\n4. File > Save Screenshot...\r\n5. enter a file name **with an extension** but make sure it's a unique name.\r\n\r\n## Expected behavior\r\n\r\nNo warning should be raised if the file doesn't exist, the dialog should just disappear and the file should be created.\r\nIf the warning is raised and the user clicks `no` to not overwrite, the dialog should remain open so the user can change the name.\r\n\r\n## Environment\r\n\r\n```\r\nnapari: 0.4.18\r\nPlatform: macOS-13.4.1-arm64-arm-64bit\r\nSystem: MacOS 13.4.1\r\nPython: 3.10.12 | packaged by conda-forge | (main, Jun 23 2023, 22:41:52) [Clang 15.0.7 ]\r\nQt: 5.15.6\r\nPyQt5: 5.15.7\r\nNumPy: 1.25.1\r\nSciPy: 1.11.1\r\nDask: 2023.7.0\r\nVisPy: 0.12.2\r\nmagicgui: 0.7.2\r\nsuperqt: unknown\r\nin-n-out: 0.1.8\r\napp-model: 0.2.0\r\nnpe2: 0.7.0\r\n\r\nOpenGL:\r\n- GL version: 2.1 Metal - 83.1\r\n- MAX_TEXTURE_SIZE: 16384\r\n\r\nScreens:\r\n- screen 1: resolution 1800x1169, scale 2.0\r\n\r\nSettings path:\r\n- /Users/sobolp/Library/Application Support/napari/napari-418_d279d6cf5d4193876ed97858e757fe322037331b/settings.yaml\r\n\r\n```\r\n\r\n## Additional context\r\n\r\nOther dialogs, like Save Selected Layer work fine.\r\nUsing the native dialog (when running napari from the command line) does not have this issue.\n", "before_files": [{"content": "import os\nfrom pathlib import Path\nfrom typing import Any, Callable\n\nfrom qtpy.QtWidgets import QFileDialog, QMessageBox\n\nfrom napari.utils.misc import in_ipython\nfrom napari.utils.translations import trans\n\nHOME_DIRECTORY = str(Path.home())\n\n\nclass ScreenshotDialog(QFileDialog):\n    \"\"\"\n    Dialog to chose save location of screenshot.\n\n    Parameters\n    ----------\n    save_function : Callable[[str], Any],\n        Function to be called on success of selecting save location\n     parent : QWidget, optional\n        Optional parent widget for this widget..\n    directory : str, optional\n        Starting directory to be set to File Dialog\n\n    \"\"\"\n\n    def __init__(\n        self,\n        save_function: Callable[[str], Any],\n        parent=None,\n        directory=HOME_DIRECTORY,\n        history=None,\n    ) -> None:\n        super().__init__(parent, trans._(\"Save screenshot\"))\n        self.setAcceptMode(QFileDialog.AcceptSave)\n        self.setFileMode(QFileDialog.AnyFile)\n        self.setNameFilter(\n            trans._(\"Image files (*.png *.bmp *.gif *.tif *.tiff)\")\n        )\n        self.setDirectory(directory)\n        self.setHistory(history)\n\n        if in_ipython():\n            self.setOptions(QFileDialog.DontUseNativeDialog)\n\n        self.save_function = save_function\n\n    def accept(self):\n        save_path = self.selectedFiles()[0]\n        if os.path.splitext(save_path)[1] == \"\":\n            save_path = save_path + \".png\"\n            if os.path.exists(save_path):\n                res = QMessageBox().warning(\n                    self,\n                    trans._(\"Confirm overwrite\"),\n                    trans._(\n                        \"{save_path} already exists. Do you want to replace it?\",\n                        save_path=save_path,\n                    ),\n                    QMessageBox.Yes | QMessageBox.No,\n                    QMessageBox.No,\n                )\n                if res != QMessageBox.Yes:\n                    # standard accept return 1, reject 0. This inform that dialog should be reopened\n                    super().accept()\n                    self.exec_()\n        self.save_function(save_path)\n        return super().accept()\n", "path": "napari/_qt/dialogs/screenshot_dialog.py"}]}