unipoll: add a --unipoll parameter to gtktiledviewer.
Arguably should be the default. Implementation is a bit cute - re-starting the main-loop as a child of a callback from its idle handler. Change-Id: I95e87c8a4ae3de745d7ca1f636859dd1d8deca17 Reviewed-on: https://gerrit.libreoffice.org/72072 Tested-by: Jenkins Reviewed-by: Michael Meeks <firstname.lastname@example.org>
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