Catch 'clipboard already open' errors in editors

Apparently following commits have not fixed the problem completely,
because it still happens (although not so often).

changeset: 2019:b8f795bdfe9f
user: Andrey Skvortsov <andrej.skvortzov@gmail.com>
date: Fri May 25 17:40:29 2018 +0300
summary: fix hangs on mouse selection in case if wxPython uses wxWidgets with GTK3+ support

changeset: 2018:5ce6d08ff2c7
user: Andrey Skvortsov <andrej.skvortzov@gmail.com>
date: Fri May 25 17:23:15 2018 +0300
summary: make clipboard open minimal time as wxPython documentation recommends

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#!/bin/sh

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LC_ALL=ru_RU.utf-8

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export DISPLAY=:42

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Xvfb $DISPLAY -screen 0 1280x1024x24 &

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sleep 1

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ret=0

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DELAY=400

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KILL_DELAY=$(($DELAY + 30))

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timeout -k $KILL_DELAY $DELAY pytest --timeout=10 ./tests/tools

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ret=$?

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pkill -9 Xvfb

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exit $ret