Description of problem:
I pressed Ctrl+Enter and Builder crashed

Version-Release number of selected component:
gnome-builder-3.16.3-1.fc22

Additional info:
reporter:       libreport-2.5.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-builder --gapplication-service
crash_function: magazine_cache_pop_magazine
executable:     /usr/bin/gnome-builder
global_pid:     16582
kernel:         4.0.4-301.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 magazine_cache_pop_magazine at gslice.c:746
 #1 thread_memory_magazine1_reload at gslice.c:801
 #2 g_slice_alloc at gslice.c:996
 #3 g_slice_alloc0 at gslice.c:1032
 #4 g_type_create_instance at gtype.c:1852
 #5 g_object_new_internal at gobject.c:1774
 #8 gtk_css_animated_style_new at gtkcssanimatedstyle.c:422
 #9 _gtk_style_context_validate at gtkstylecontext.c:3014
 #19 gtk_container_idle_sizer at gtkcontainer.c:1856
 #20 _g_closure_invoke_va at gclosure.c:831