dev-python/matplotlib: Fix test regression

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/matplotlib/files/matplotlib-3.4.1-xelatex-test.patch

@@ -0,0 +1,74 @@
+From d0f92f582800b6bd6b4bb2e59cd7e5b3cd6b5948 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
+Date: Sun, 20 Jun 2021 14:46:17 +0200
+Subject: [PATCH] _GSConverter: handle stray 'GS' in output gracefully
+
+Search the GS output stream for either "GS<" or "GS>" explicitly rather
+than any "GS", in order to prevent the code from wrongly matching stray
+"GS".  This fixes a recent test regression on Gentoo where the following
+output seems to have been wrongly matched:
+
+    **** Error 'gs' ignored -- ExtGState missing from Resources.
+                                  ^^
+
+Fixes #20472
+---
+ lib/matplotlib/testing/compare.py | 20 +++++++++++---------
+ 1 file changed, 11 insertions(+), 9 deletions(-)
+
+diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py
+index 3957188b3e2..27af3e186bd 100644
+--- a/lib/matplotlib/testing/compare.py
++++ b/lib/matplotlib/testing/compare.py
+@@ -154,15 +154,17 @@ def encode_and_escape(name):
+             + b") run flush\n")
+         self._proc.stdin.flush()
+         # GS> if nothing left on the stack; GS<n> if n items left on the stack.
+-        err = self._read_until(b"GS")
+-        stack = self._read_until(b">")
+-        if stack or not os.path.exists(dest):
+-            stack_size = int(stack[1:]) if stack else 0
+-            self._proc.stdin.write(b"pop\n" * stack_size)
+-            # Using the systemencoding should at least get the filenames right.
+-            raise ImageComparisonFailure(
+-                (err + b"GS" + stack + b">")
+-                .decode(sys.getfilesystemencoding(), "replace"))
++        err = self._read_until((b"GS<", b"GS>"))
++        if err.endswith(b"GS<"):
++            stack = self._read_until(b">")
++            if stack or not os.path.exists(dest):
++                stack_size = int(stack[1:]) if stack else 0
++                self._proc.stdin.write(b"pop\n" * stack_size)
++                # Using the systemencoding should at least get the filenames
++                # right.
++                raise ImageComparisonFailure(
++                    (err + b"GS" + stack + b">")
++                    .decode(sys.getfilesystemencoding(), "replace"))
+ 
+ 
+ class _SVGConverter(_Converter):
+From d73dd52edf7ec106cf2f6c0ffc79dcda31102ecd Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
+Date: Sun, 20 Jun 2021 15:07:56 +0200
+Subject: [PATCH] increase test_backend_pgf.py::test_xelatex[pdf] tol
+
+---
+ lib/matplotlib/tests/test_backend_pgf.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/matplotlib/tests/test_backend_pgf.py b/lib/matplotlib/tests/test_backend_pgf.py
+index 55e375311..684f38fb7 100644
+--- a/lib/matplotlib/tests/test_backend_pgf.py
++++ b/lib/matplotlib/tests/test_backend_pgf.py
+@@ -80,7 +80,7 @@ def test_common_texification(plain_text, escaped_text):
+ # test compiling a figure to pdf with xelatex
+ @needs_xelatex
+ @pytest.mark.backend('pgf')
+-@image_comparison(['pgf_xelatex.pdf'], style='default')
++@image_comparison(['pgf_xelatex.pdf'], style='default', tol=0.8)
+ def test_xelatex():
+     rc_xelatex = {'font.family': 'serif',
+                   'pgf.rcfonts': False}
+-- 
+2.32.0
+

dev-python/matplotlib/matplotlib-3.4.1.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-PYTHON_COMPAT=( python3_{7..9} )
+PYTHON_COMPAT=( python3_{8..9} )
 PYTHON_REQ_USE='tk?,threads(+)'
 
 inherit distutils-r1 flag-o-matic virtualx toolchain-funcs prefix
@@ -147,6 +147,7 @@ python_prepare_all() {
 	local PATCHES=(
 		"${FILESDIR}"/matplotlib-3.4.0-test.patch
 		"${FILESDIR}"/matplotlib-3.3.3-disable-lto.patch
+		"${FILESDIR}"/matplotlib-3.4.1-xelatex-test.patch
 	)
 
 	# requires jupyter-nbconvert