make sure all test X clients connect to the Xvfb instance #172
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Export the DISPLAY variable immediately after starting Xvfb so that any X clients started after that, including the recently added xdotool, will be sure to use it. Without this change, setting DISPLAY (without exporting it) in alttab_simple_cycle() does not work when that variable is not already exported, e.g. when running in an isolated environment like a container or a chroot environment.
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Export the DISPLAY variable immediately after starting Xvfb so that any X clients started after that, including the recently added xdotool, will be sure to use it. Without this change, setting DISPLAY (without exporting it) in alttab_simple_cycle() does not work when that variable is not already exported, e.g. when running in an isolated environment like a container or a chroot environment.