Nov 13, 2025 · Nov 14, 2025
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
        self.toolbar = None  # NavigationToolbar2 will set me
        self._is_idle_drawing = False
        # We don't want to scale up the figure DPI more than once.
        figure._original_dpi = figure.dpi
        figure._original_dpi =getattr(figure, '_original_dpi', figure.dpi)
        self._device_pixel_ratio = 1
        super().__init__()  # Typically the GUI widget init (if any).

diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
        This is used upon initialization of the Figure, but also
        to reset the canvas when decoupling from pyplot.
        """
        # check if we have changed the DPI due to hi-dpi screens
        orig_dpi = getattr(self, '_original_dpi', self._dpi)
        FigureCanvasBase(self)  # Set self.canvas as a side-effect
        #put it back to what it was
        iforig_dpi != self._dpi:
            self.dpi =orig_dpi
        #undo any high-dpi scaling
        ifself._dpi != self._original_dpi:
            self.dpi =self._original_dpi

    def set_canvas(self, canvas):
        """
        self.__dict__ = state

        # re-initialise some of the unstored state information
        FigureCanvasBase(self)  # Set self.canvas.

        self._set_base_canvas()
        # force the bounding boxes to respect current dpi
        self.dpi_scale_trans.clear().scale(self._dpi)
        if restore_to_pylab:
            # lazy import to avoid circularity
            import matplotlib.pyplot as plt
diff --git a/lib/matplotlib/tests/test_figure.py b/lib/matplotlib/tests/test_figure.py
    assert fig.dpi == 42*7
    fig2 = pickle.loads(pickle.dumps(fig))
    assert fig2.dpi == 42
    assert all(
        [orig / 7 == restore for orig, restore in zip(fig.bbox.max, fig2.bbox.max)]
    )


 def test_gridspec_no_mutate_input():
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1763,7 +1763,7 @@ def __init__(self, figure=None):
		self.toolbar = None # NavigationToolbar2 will set me
		self._is_idle_drawing = False
		# We don't want to scale up the figure DPI more than once.
		figure._original_dpi = figure.dpi
		figure._original_dpi =getattr(figure, '_original_dpi', figure.dpi)
		self._device_pixel_ratio = 1
		super().__init__() # Typically the GUI widget init (if any).

Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3003,12 +3003,10 @@ def _set_base_canvas(self):
		This is used upon initialization of the Figure, but also
		to reset the canvas when decoupling from pyplot.
		"""
		# check if we have changed the DPI due to hi-dpi screens
		orig_dpi = getattr(self, '_original_dpi', self._dpi)
		FigureCanvasBase(self) # Set self.canvas as a side-effect
		#put it back to what it was
		iforig_dpi != self._dpi:
		self.dpi =orig_dpi
		#undo any high-dpi scaling
		ifself._dpi != self._original_dpi:
		self.dpi =self._original_dpi

		def set_canvas(self, canvas):
		"""
Expand DownExpand Up		@@ -3323,8 +3321,9 @@ def __setstate__(self, state):
		self.__dict__ = state

		# re-initialise some of the unstored state information
		FigureCanvasBase(self) # Set self.canvas.

		self._set_base_canvas()
		# force the bounding boxes to respect current dpi
		self.dpi_scale_trans.clear().scale(self._dpi)
		if restore_to_pylab:
		# lazy import to avoid circularity
		import matplotlib.pyplot as plt
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1688,6 +1688,9 @@ def test_unpickle_with_device_pixel_ratio():
		assert fig.dpi == 42*7
		fig2 = pickle.loads(pickle.dumps(fig))
		assert fig2.dpi == 42
		assert all(
		[orig / 7 == restore for orig, restore in zip(fig.bbox.max, fig2.bbox.max)]
		)


		def test_gridspec_no_mutate_input():
Expand Down