From 7247b1c84e75a8e32d3c33d599f2c186c3af8310 Mon Sep 17 00:00:00 2001
From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
Date: Tue, 4 May 2021 00:46:19 -0400
Subject: [PATCH 1/5] ci: Bump Ubuntu to 18.04 LTS.

Ubuntu 16.04 LTS went EOL at the end of April 2021.
---
 .github/workflows/tests.yml | 16 ++++++----------
 azure-pipelines.yml         |  6 +++---
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index eb5530661584..34ff72f30e16 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,18 +22,18 @@ jobs:
       matrix:
         include:
           - name-suffix: "(Minimum Versions)"
-            os: ubuntu-16.04
+            os: ubuntu-18.04
             python-version: 3.7
             extra-requirements: '-c requirements/testing/minver.txt'
             pyqt5-ver: '==5.8 sip==4.19.7'  # oldest versions with a Py3.7 wheel.
             delete-font-cache: true
             XVFB_RUN: xvfb-run -a
-          - os: ubuntu-16.04
+          - os: ubuntu-18.04
             python-version: 3.7
             extra-requirements: '-r requirements/testing/extra.txt'
             XVFB_RUN: xvfb-run -a
             CFLAGS: "-fno-lto"  # Ensure that disabling LTO works.
-          - os: ubuntu-16.04
+          - os: ubuntu-18.04
             python-version: 3.8
             extra-requirements: '-r requirements/testing/extra.txt'
             XVFB_RUN: xvfb-run -a
@@ -156,12 +156,8 @@ jobs:
           # libraries cannot be loaded at runtime, so an actual import is a
           # better check).
           if [[ "${{ runner.os }}" != 'macOS' ]]; then
-            # PyGObject, pycairo, and cariocffi do not install on OSX 10.12;
-            # pycairo 1.20+ requires a new version of Cairo, unavailable on
-            # Ubuntu 16.04, so PyGObject must be installed without build
-            # isolation in order to pick up the lower pre-installed version.
-             python -m pip install --upgrade 'pycairo<1.20.0' 'cairocffi>=0.8' &&
-             python -m pip install --upgrade --no-build-isolation PyGObject &&
+            # PyGObject, pycairo, and cariocffi do not install on OSX 10.12.
+             python -m pip install --upgrade pycairo 'cairocffi>=0.8' PyGObject &&
                python -c 'import gi; gi.require_version("Gtk", "3.0"); from gi.repository import Gtk' &&
                echo 'PyGObject is available' ||
                echo 'PyGObject is not available'
@@ -180,7 +176,7 @@ jobs:
                echo 'PySide2 is not available'
           fi
           python -m pip install --upgrade \
-            -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 \
+            -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-18.04 \
             wxPython &&
             python -c 'import wx' &&
             echo 'wxPython is available' ||
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 2ff87d0c71da..2c25a7786288 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -6,13 +6,13 @@
 strategy:
   matrix:
     Linux_py37:
-      vmImage: 'ubuntu-16.04'
+      vmImage: 'ubuntu-18.04'
       python.version: '3.7'
     Linux_py38:
-      vmImage: 'ubuntu-16.04'
+      vmImage: 'ubuntu-18.04'
       python.version: '3.8'
     Linux_py39:
-      vmImage: 'ubuntu-16.04'
+      vmImage: 'ubuntu-18.04'
       python.version: '3.9'
     macOS_py37:
       vmImage: 'macOS-10.15'

From 87a9b4f6e9c684566a2f6a84e17abcdc9e32eb69 Mon Sep 17 00:00:00 2001
From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
Date: Tue, 4 May 2021 01:15:49 -0400
Subject: [PATCH 2/5] Update mixedmode test result.

Presumably some external dependency has changed the result, likely
Ghostscript. This has been broken on Fedora for some time, but we never
updated it because CI was on Ubuntu 16.04.
---
 .../test_backend_pgf/pgf_mixedmode.pdf        | Bin 10967 -> 9822 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)

diff --git a/lib/matplotlib/tests/baseline_images/test_backend_pgf/pgf_mixedmode.pdf b/lib/matplotlib/tests/baseline_images/test_backend_pgf/pgf_mixedmode.pdf
index fdbb20349c42f67ed7c36d2c51ab80ddf9219019..fd7cf7a5c0d1849f2588809771c179c101a99a00 100644
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From ea09d95626d2b4836d92965b6269f1210a60d773 Mon Sep 17 00:00:00 2001
From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
Date: Tue, 4 May 2021 19:37:10 -0400
Subject: [PATCH 3/5] TST: Ignore Producer key mismatches in PGF metadata.

Some LaTeX engines ignore the setting of this key in hyperref, but
otherwise obey the request metadata. This is likely still okay, but
leave a note in the docs as well.
---
 lib/matplotlib/backends/backend_pgf.py   | 3 +++
 lib/matplotlib/tests/test_backend_pgf.py | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
index 9738d07457fc..1a647d37153f 100644
--- a/lib/matplotlib/backends/backend_pgf.py
+++ b/lib/matplotlib/backends/backend_pgf.py
@@ -948,6 +948,9 @@ def __init__(self, filename, *, keep_empty=True, metadata=None):
             'Creator', 'Producer', 'CreationDate', 'ModDate', and
             'Trapped'. Values have been predefined for 'Creator', 'Producer'
             and 'CreationDate'. They can be removed by setting them to `None`.
+
+            Note that some versions of LaTeX engines may ignore the 'Producer'
+            key and set it to themselves.
         """
         self._output_name = filename
         self._n_figures = 0
diff --git a/lib/matplotlib/tests/test_backend_pgf.py b/lib/matplotlib/tests/test_backend_pgf.py
index 75f50ecbf0d9..040b2e714655 100644
--- a/lib/matplotlib/tests/test_backend_pgf.py
+++ b/lib/matplotlib/tests/test_backend_pgf.py
@@ -257,13 +257,17 @@ def test_pdf_pages_metadata_check(monkeypatch, system):
     if '/PTEX.Fullbanner' in info:
         del info['/PTEX.Fullbanner']
 
+    # Some LaTeX engines ignore this setting, and state themselves as producer.
+    producer = info.pop('/Producer')
+    assert producer == f'Matplotlib pgf backend v{mpl.__version__}' or (
+            system == 'lualatex' and 'LuaTeX' in producer)
+
     assert info == {
         '/Author': 'me',
         '/CreationDate': 'D:19700101000000Z',
         '/Creator': f'Matplotlib v{mpl.__version__}, https://matplotlib.org',
         '/Keywords': 'test,pdf,multipage',
         '/ModDate': 'D:19680801000000Z',
-        '/Producer': f'Matplotlib pgf backend v{mpl.__version__}',
         '/Subject': 'Test page',
         '/Title': 'Multipage PDF with pgf',
         '/Trapped': '/True',

From bb52af03ccbe8e606e2b2e3769590c726279c8a6 Mon Sep 17 00:00:00 2001
From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
Date: Tue, 4 May 2021 19:47:26 -0400
Subject: [PATCH 4/5] ci: Upload result images if tests fail.

---
 .github/workflows/tests.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 34ff72f30e16..ed4e6219f2c6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -222,3 +222,9 @@ jobs:
         if: ${{ runner.os != 'macOS' }}
       - name: Upload code coverage
         uses: codecov/codecov-action@v1
+
+      - uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: "${{ matrix.python-version }} ${{ matrix.os }} ${{ matrix.name-suffix }} result images"
+          path: ./result_images

From ab053fdecaf095e692f5190f5c7fcd0693eb1bc8 Mon Sep 17 00:00:00 2001
From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
Date: Wed, 5 May 2021 04:38:25 -0400
Subject: [PATCH 5/5] ci: Invalidate Matplotlib caches on test runners.

These store files that were created with older versions of system
dependencies, so need to be regenerated.
---
 .github/workflows/tests.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ed4e6219f2c6..ae5807d20879 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -128,10 +128,10 @@ jobs:
             ~/.cache/matplotlib
             !~/.cache/matplotlib/tex.cache
             !~/.cache/matplotlib/test_cache
-          key: ${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-${{ github.sha }}
+          key: 1-${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-
-            ${{ runner.os }}-py${{ matrix.python-version }}-mpl-
+            1-${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-
+            1-${{ runner.os }}-py${{ matrix.python-version }}-mpl-
 
       - name: Install Python dependencies
         run: |