Comment 2 for bug 1293144

StacktraceTop:
 folder_tree_maybe_expand_row (model=0x7f8858020390, tree_path=0x7f88681549b0, iter=<optimized out>, folder_tree=0x7f88d37907c0) at em-folder-tree.c:564
 g_closure_invoke (closure=0x7f88d3790b60, return_value=0x0, n_param_values=3, param_values=0x7fffee4cfae0, invocation_hint=0x7fffee4cfa80) at /build/buildd/glib2.0-2.39.91/./gobject/gclosure.c:768
 signal_emit_unlocked_R (node=node@entry=0x7f88d0919fc0, detail=detail@entry=0, instance=instance@entry=0x7f8858020390, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffee4cfae0) at /build/buildd/glib2.0-2.39.91/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffee4cfc98) at /build/buildd/glib2.0-2.39.91/./gobject/gsignal.c:3307
 g_signal_emit (instance=instance@entry=0x7f8858020390, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.39.91/./gobject/gsignal.c:3363