prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  HistogramLUTWidget kargs bug?
  # lut_widget = HistogramLUTWidget(background='w')
  
   File "/usr/local/lib/python3.4/dist-packages/pyqtgraph-0.9.8-py3.4.egg/pyqtgraph/widgets/HistogramLUTWidget.py", line 18, in **init**
      self.item = HistogramLUTItem(_args, *_kargs)
  # TypeError: **init**() got an unexpected keyword argument 'background'
  
  I can fix it by:
  
  class HistogramLUTWidget(pg.GraphicsView):
  
  ```
  def __init__(self, parent=None,  *args, **kargs):
      # background = kargs.get('background', 'default')
      background = kargs.pop('background', 'default')
  ```
  
  ...
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `pyqtgraph/widgets/HistogramLUTWidget.py`
  Content:
  ```
  1 """
  2 Widget displaying an image histogram along with gradient editor. Can be used to adjust the appearance of images.
  3 This is a wrapper around HistogramLUTItem
  4 """
  5 
  6 from ..Qt import QtGui, QtCore
  7 from .GraphicsView import GraphicsView
  8 from ..graphicsItems.HistogramLUTItem import HistogramLUTItem
  9 
  10 __all__ = ['HistogramLUTWidget']
  11 
  12 
  13 class HistogramLUTWidget(GraphicsView):
  14     
  15     def __init__(self, parent=None,  *args, **kargs):
  16         background = kargs.get('background', 'default')
  17         GraphicsView.__init__(self, parent, useOpenGL=False, background=background)
  18         self.item = HistogramLUTItem(*args, **kargs)
  19         self.setCentralItem(self.item)
  20         self.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Expanding)
  21         self.setMinimumWidth(95)
  22         
  23 
  24     def sizeHint(self):
  25         return QtCore.QSize(115, 200)
  26     
  27     
  28 
  29     def __getattr__(self, attr):
  30         return getattr(self.item, attr)
  31 
  32 
  33 
  34
  ```
  --- 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()
  
  ```
  
golden_diff: diff --git a/pyqtgraph/widgets/HistogramLUTWidget.py b/pyqtgraph/widgets/HistogramLUTWidget.py
  --- a/pyqtgraph/widgets/HistogramLUTWidget.py
  +++ b/pyqtgraph/widgets/HistogramLUTWidget.py
  @@ -13,7 +13,7 @@
   class HistogramLUTWidget(GraphicsView):
       
       def __init__(self, parent=None,  *args, **kargs):
  -        background = kargs.get('background', 'default')
  +        background = kargs.pop('background', 'default')
           GraphicsView.__init__(self, parent, useOpenGL=False, background=background)
           self.item = HistogramLUTItem(*args, **kargs)
           self.setCentralItem(self.item)
  
verification_info: {"golden_diff": "diff --git a/pyqtgraph/widgets/HistogramLUTWidget.py b/pyqtgraph/widgets/HistogramLUTWidget.py\n--- a/pyqtgraph/widgets/HistogramLUTWidget.py\n+++ b/pyqtgraph/widgets/HistogramLUTWidget.py\n@@ -13,7 +13,7 @@\n class HistogramLUTWidget(GraphicsView):\n     \n     def __init__(self, parent=None,  *args, **kargs):\n-        background = kargs.get('background', 'default')\n+        background = kargs.pop('background', 'default')\n         GraphicsView.__init__(self, parent, useOpenGL=False, background=background)\n         self.item = HistogramLUTItem(*args, **kargs)\n         self.setCentralItem(self.item)\n", "issue": "HistogramLUTWidget kargs bug?\n# lut_widget = HistogramLUTWidget(background='w')\n\n File \"/usr/local/lib/python3.4/dist-packages/pyqtgraph-0.9.8-py3.4.egg/pyqtgraph/widgets/HistogramLUTWidget.py\", line 18, in **init**\n    self.item = HistogramLUTItem(_args, *_kargs)\n# TypeError: **init**() got an unexpected keyword argument 'background'\n\nI can fix it by:\n\nclass HistogramLUTWidget(pg.GraphicsView):\n\n```\ndef __init__(self, parent=None,  *args, **kargs):\n    # background = kargs.get('background', 'default')\n    background = kargs.pop('background', 'default')\n```\n\n...\n\n", "before_files": [{"content": "\"\"\"\nWidget displaying an image histogram along with gradient editor. Can be used to adjust the appearance of images.\nThis is a wrapper around HistogramLUTItem\n\"\"\"\n\nfrom ..Qt import QtGui, QtCore\nfrom .GraphicsView import GraphicsView\nfrom ..graphicsItems.HistogramLUTItem import HistogramLUTItem\n\n__all__ = ['HistogramLUTWidget']\n\n\nclass HistogramLUTWidget(GraphicsView):\n    \n    def __init__(self, parent=None,  *args, **kargs):\n        background = kargs.get('background', 'default')\n        GraphicsView.__init__(self, parent, useOpenGL=False, background=background)\n        self.item = HistogramLUTItem(*args, **kargs)\n        self.setCentralItem(self.item)\n        self.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Expanding)\n        self.setMinimumWidth(95)\n        \n\n    def sizeHint(self):\n        return QtCore.QSize(115, 200)\n    \n    \n\n    def __getattr__(self, attr):\n        return getattr(self.item, attr)\n\n\n\n", "path": "pyqtgraph/widgets/HistogramLUTWidget.py"}], "after_files": [{"content": "\"\"\"\nWidget displaying an image histogram along with gradient editor. Can be used to adjust the appearance of images.\nThis is a wrapper around HistogramLUTItem\n\"\"\"\n\nfrom ..Qt import QtGui, QtCore\nfrom .GraphicsView import GraphicsView\nfrom ..graphicsItems.HistogramLUTItem import HistogramLUTItem\n\n__all__ = ['HistogramLUTWidget']\n\n\nclass HistogramLUTWidget(GraphicsView):\n    \n    def __init__(self, parent=None,  *args, **kargs):\n        background = kargs.pop('background', 'default')\n        GraphicsView.__init__(self, parent, useOpenGL=False, background=background)\n        self.item = HistogramLUTItem(*args, **kargs)\n        self.setCentralItem(self.item)\n        self.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Expanding)\n        self.setMinimumWidth(95)\n        \n\n    def sizeHint(self):\n        return QtCore.QSize(115, 200)\n    \n    \n\n    def __getattr__(self, attr):\n        return getattr(self.item, attr)\n\n\n\n", "path": "pyqtgraph/widgets/HistogramLUTWidget.py"}]}