MAINT: Fix Qt issue (mne-tools#10923)

* WIP: Debug Qt issue [skip circle] [skip azp]

* FIX: Try another

* FIX: Anothur

* FIX: Commeunt

Author: larsoner

.github/workflows/linux_pip.yml

@@ -50,6 +50,9 @@ jobs:
       - shell: bash -el {0}
         run: ./tools/github_actions_infos.sh
         name: 'Show infos'
+      # Uncomment if "xcb not found" Qt errors/segfaults come up again
+      # - shell: bash -el {0}
+      #   run: LD_DEBUG=libs python -c "from PyQt6.QtWidgets import QApplication, QWidget; app = QApplication([]); import matplotlib; matplotlib.use('QtAgg'); import matplotlib.pyplot as plt; plt.figure()"
       - shell: bash -el {0}
         run: ./tools/get_testing_version.sh
         name: 'Get testing version'

azure-pipelines.yml

@@ -125,6 +125,10 @@ stages:
         mne sys_info -pd
         mne sys_info -pd | grep "qtpy: .*{PySide6=.*}$"
       displayName: Print config
+    # Uncomment if "xcb not found" Qt errors/segfaults come up again
+    # - bash: |
+    #     set -e
+    #     LD_DEBUG=libs python -c "from PySide6.QtWidgets import QApplication, QWidget; app = QApplication([]); import matplotlib; matplotlib.use('QtAgg'); import matplotlib.pyplot as plt; plt.figure()"
     - bash: source tools/get_testing_version.sh
       displayName: 'Get testing version'
     - task: Cache@2

tools/setup_xvfb.sh

@@ -11,5 +11,5 @@ done
 
 # This also includes the libraries necessary for PyQt5/PyQt6
 sudo apt update
-sudo apt install -yqq xvfb libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0 libopengl0 libegl1 libosmesa6 mesa-utils
+sudo apt install -yqq xvfb libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0 libopengl0 libegl1 libosmesa6 mesa-utils libxcb-shape0
 /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -screen 0 1400x900x24 -ac +extension GLX +render -noreset