restore clipboard setup?

Author: TomAugspurger

.travis.yml

@@ -85,6 +85,15 @@ install:
   - ci/submit_cython_cache.sh
   - echo "install done"
 
+
+before_script:
+  # display server (for clipboard functionality) needs to be started here,
+  # does not work if done in install:setup_env.sh (GH-26103)
+  - export DISPLAY=":99.0"
+  - echo "sh -e /etc/init.d/xvfb start"
+  - if [ "$JOB" != "3.8-dev" ]; then sh -e /etc/init.d/xvfb start; fi
+  - sleep 3
+
 script:
   - echo "script start"
   - echo "$JOB"