Jan 11, 2023 · Jan 11, 2023
diff --git a/doc/api/next_api_changes/behavior/24655-AK.rst b/doc/api/next_api_changes/behavior/24655-AK.rst
 On Windows only fonts known to the registry will be discovered
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 Previously, Matplotlib would recursively walk user and system font directories
 to discover fonts, however this lead to a number of undesirable behaviors
 including finding deleted fonts. Now Matplotlib will only find fonts that are
 known to the Windows registry.

 This means that any user installed fonts must go through the Windows font
 installer rather than simply being copied to the correct folder.

 This only impacts the set of fonts Matplotlib will consider when using
 `matplotlib.font_manager.findfont`. To use an arbitrary font, directly pass the
 path to a font as shown in
 :doc:`/gallery/text_labels_and_annotations/font_file`.
diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
    recursively under the directory.
    """
    extensions = ["." + ext for ext in extensions]
    if sys.platform == 'win32' and directory == win32FontDirectory():
        return [os.path.join(directory, filename)
                for filename in os.listdir(directory)
                if os.path.isfile(os.path.join(directory, filename))]
    else:
        return [os.path.join(dirpath, filename)
                # os.walk ignores access errors, unlike Path.glob.
                for dirpath, _, filenames in os.walk(directory)
                for filename in filenames
                if Path(filename).suffix.lower() in extensions]
    return [os.path.join(dirpath, filename)
            # os.walk ignores access errors, unlike Path.glob.
            for dirpath, _, filenames in os.walk(directory)
            for filename in filenames
            if Path(filename).suffix.lower() in extensions]


 def win32FontDirectory():
    if fontpaths is None:
        if sys.platform == 'win32':
            installed_fonts = _get_win32_installed_fonts()
            fontpaths =MSUserFontDirectories + [win32FontDirectory()]
            fontpaths =[]
        else:
            installed_fonts = _get_fontconfig_fonts()
            if sys.platform == 'darwin':
diff --git a/lib/matplotlib/tests/test_font_manager.py b/lib/matplotlib/tests/test_font_manager.py
        pytest.xfail("This test should only run on CI (appveyor or azure) "
                     "as the developer's font directory should remain "
                     "unchanged.")

    pytest.xfail("We need to update the registry for this test to work")
    font_test_file = 'mpltest.ttf'

    # Precondition: the test font should not be available
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,15 @@
		On Windows only fonts known to the registry will be discovered
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

		Previously, Matplotlib would recursively walk user and system font directories
		to discover fonts, however this lead to a number of undesirable behaviors
		including finding deleted fonts. Now Matplotlib will only find fonts that are
		known to the Windows registry.

		This means that any user installed fonts must go through the Windows font
		installer rather than simply being copied to the correct folder.

		This only impacts the set of fonts Matplotlib will consider when using
		`matplotlib.font_manager.findfont`. To use an arbitrary font, directly pass the
		path to a font as shown in
		:doc:`/gallery/text_labels_and_annotations/font_file`.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -186,16 +186,11 @@ def list_fonts(directory, extensions):
		recursively under the directory.
		"""
		extensions = ["." + ext for ext in extensions]
		if sys.platform == 'win32' and directory == win32FontDirectory():
		return [os.path.join(directory, filename)
		for filename in os.listdir(directory)
		if os.path.isfile(os.path.join(directory, filename))]
		else:
		return [os.path.join(dirpath, filename)
		# os.walk ignores access errors, unlike Path.glob.
		for dirpath, _, filenames in os.walk(directory)
		for filename in filenames
		if Path(filename).suffix.lower() in extensions]
		return [os.path.join(dirpath, filename)
		# os.walk ignores access errors, unlike Path.glob.
		for dirpath, _, filenames in os.walk(directory)
		for filename in filenames
		if Path(filename).suffix.lower() in extensions]


		def win32FontDirectory():
Expand DownExpand Up		@@ -275,7 +270,7 @@ def findSystemFonts(fontpaths=None, fontext='ttf'):
		if fontpaths is None:
		if sys.platform == 'win32':
		installed_fonts = _get_win32_installed_fonts()
		fontpaths =MSUserFontDirectories + [win32FontDirectory()]
		fontpaths =[]
		else:
		installed_fonts = _get_fontconfig_fonts()
		if sys.platform == 'darwin':
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -200,7 +200,7 @@ def test_user_fonts_win32():
		pytest.xfail("This test should only run on CI (appveyor or azure) "
		"as the developer's font directory should remain "
		"unchanged.")

		pytest.xfail("We need to update the registry for this test to work")
		font_test_file = 'mpltest.ttf'

		# Precondition: the test font should not be available
Expand Down