Do not repeatedly press Enter until the GNOME Run dialog vanishes.
The repeated pressing was introduced earlier (in commit c80ae9e) to workaround a possible GTK bug (or similar). However, if sikuli is faster than GNOME, sikuli may `find` the GNOME Run dialog even after pressing Enter, hence pressing Enter more than once. The extra Enter:s may propagate to whatever application that was started by the run dialog, which in the case of the Unsafe Browser, for instance, will close its verification window. To workaround the original issue we instead simply sleep for a short time inbetween typing the command and pressing Enter.
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