FIXED (tentative) testing another way to run Xfvb

.gitlab/test.sh

@@ -16,10 +16,10 @@ if [[ "$osName" != "win7" ]]; then
     echo "===== Configuring xvfb ====="
     # Starts the server first (try to avoid unexpected and random "QXcbConnection: Could not connect to display :99")
     # see also https://doc.qt.io/qt-5/embedded-linux.html#linuxfb 
-    Xvfb :42 -screen 0 1600x1200x24 -ac +extension GLX +render -noreset -v -fbdir $workingDir/ &
-    xvfbPid=$!
-    echo "PID of Xvfb: $xvfbPid"
-    export DISPLAY=:42
+    export DISPLAY=":98"
+    Xvfb $DISPLAY -screen 0 1600x1200x24 -ac +extension GLX +render -noreset -v -fbdir $workingDir/ &> ${PROJECT_LOG_DIR}/test.log &
+    trap "kill $! || true" EXIT
+    sleep 10
     export XAUTHORITY=/dev/null
 fi
 
@@ -35,10 +35,10 @@ ctest -VV \
       -S $PROJECT_SOURCE_DIR/sdk/cmake/ctest/ci-test.cmake > >(tee ${PROJECT_LOG_DIR}/test.log | grep --line-buffered -e "Test \#") 2>&1
 
 
-if [[ "$OS" != "win7" ]]; then
-    # shutdown xvfb
-    kill $xvfbPid
-fi
+# if [[ "$OS" != "win7" ]]; then
+#     # shutdown xvfb
+#     kill $xvfbPid
+# fi
 
 # as ctest return a strange 255 error, check the log
 if grep --quiet "Fatal error" $CI_PROJECT_DIR/$PROJECT_LOG_DIR/ci-test.log; then