Fix crash when retrieving window property with invalid atom data

This happens when dropping files from dtfile, which somehow puts
non-atom stuff in window properties of type ATOM_PAIR.

* src/xselect.c (x_atom_to_symbol): Catch errors around
XGetAtomName.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/xselect.c b/src/xselect.c
index 76a2f9f5075..7719876884e 100644
--- a/src/xselect.c
+++ b/src/xselect.c
@@ -285,7 +285,9 @@ x_atom_to_symbol (struct x_display_info *dpyinfo, Atom atom)
     return QNULL;
 
   block_input ();
+  x_catch_errors (dpyinfo->display);
   str = XGetAtomName (dpyinfo->display, atom);
+  x_uncatch_errors ();
   unblock_input ();
   TRACE1 ("XGetAtomName --> %s", str);
   if (! str) return Qnil;