Description of problem:
Switching files currently crashes 100 % of times. To reproduce press the 3rd button starting from the left (above the source code) and try to switch to another file in the project.

Version-Release number of selected component:
gnome-builder-3.16.3-3.fc22

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        /usr/bin/gnome-builder --gapplication-service
crash_function: g_cclosure_marshal_VOID__ENUMv
executable:     /usr/bin/gnome-builder
global_pid:     8970
kernel:         4.1.4-200.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_cclosure_marshal_VOID__ENUMv at gmarshal.c:1496
 #1 _g_closure_invoke_va at gclosure.c:831
 #3 g_signal_emit_by_name at gsignal.c:3401
 #4 focus_cb at a11y/gtkwidgetaccessible.c:55
 #5 _gtk_marshal_BOOLEAN__BOXED at gtkmarshalers.c:85
 #10 gtk_widget_event_internal at gtkwidget.c:7787
 #11 gtk_widget_send_focus_change at gtkwidget.c:16165
 #12 do_focus_change at gtkwindow.c:7948
 #13 gtk_window_real_set_focus at gtkwindow.c:8257
 #18 _g_closure_invoke_va at gclosure.c:831