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Owen W. Taylor authored
We made a number of unchecked accesses to the selection requestor, which could cause X errors if the selection requestor vanished (or we were sent invalid events). Add error traps around all of them. See https://bugzilla.redhat.com/show_bug.cgi?id=1210814 for an example of a crash that could be caused by this. (There are about 1000 instances of such a crash in http://retrace.fedoraproject.org though no linked bug reports specifically talk about cut-and-paste or DND.) https://bugzilla.gnome.org/show_bug.cgi?id=756881
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