Sometimes when I adjust both the blur spin button
(using my mouse's scrollwheel) and the slider (by
simply clicking and dragging), I get a crash. It
doesn't always happen but it seems that when performing
the following steps, it will eventually crash:

- Open attached file
- Select the blurred spiral
- Open the Fill and Stroke dialog
- Adjust blur by scrolling mousewheel on the spin button
- Click inside the spin button (on the actual value)
once using the left mouse button
- Move the blur slider
- If you repeat the above 2 steps, eventually it wll
crash for me.

It seems the current zoom and the blur value influence
the probability of this crash occuring. Using a zoom of
49% and a blur value of around 10 seems to be a good
setting (for the crash to occur)

I get the following on the console:

(inkscape:16006): Gtk-CRITICAL **: gtk_style_detach:
assertion `style->attach_count > 0' failed

(inkscape:16006): Gtk-WARNING **: GtkEntry - did not
receive focus-out-event. If you
connect a handler to this signal, it must return
FALSE so the entry gets the event as well

Gtk-ERROR **: file gtkentry.c: line 5266 (blink_cb):
assertion failed: (GTK_WIDGET_HAS_FOCUS (entry))
aborting...

Program received signal SIGTRAP, Trace/breakpoint trap.

And the backtrace:

#0  0xb73fb2fd in IA__g_logv (log_domain=<value
optimized out>, log_level=G_LOG_LEVEL_ERROR,
format=0xb7424c70 "file %s: line %d (%s): assertion
failed: (%s)", 
    args1=0xbfb5cd0c "\021\205\214�\222\024") at
gmessages.c:493
#1  0xb73fb38a in IA__g_log (log_domain=0xb78b9ec1
"Gtk", log_level=G_LOG_LEVEL_ERROR, format=0xb7424c70
"file %s: line %d (%s): assertion failed: (%s)") at
gmessages.c:517
#2  0xb73fb402 in IA__g_assert_warning
(log_domain=0xb78b9ec1 "Gtk", file=0xb78c8511
"gtkentry.c", line=5266, pretty_function=0xb78c8f02
"blink_cb", 
    expression=0xb78c84f4 "GTK_WIDGET_HAS_FOCUS
(entry)") at gmessages.c:552
#3  0xb76bc44f in blink_cb (data=0xa52b0d0) at
gtkentry.c:5266
#4  0xb73f39f9 in g_timeout_dispatch (source=0xb2c04c8,
callback=0x9c13c58, user_data=0xa52b0d0) at gmain.c:3422
#5  0xb73f3576 in IA__g_main_context_dispatch
(context=0x857b130) at gmain.c:2045
#6  0xb73f5f82 in g_main_context_iterate
(context=0x857b130, block=0, dispatch=1,
self=0x85d71a0) at gmain.c:2677
#7  0xb73f6376 in IA__g_main_context_iteration
(context=0x857b130, may_block=0) at gmain.c:2736
#8  0xb7743c24 in IA__gtk_main_iteration_do
(blocking=0) at gtkmain.c:1097
#9  0xb7d9a0de in Gtk::Main::iteration_impl () from
/usr/lib/libgtkmm-2.4.so.1
#10 0xb7d99fca in Gtk::Main::iteration () from
/usr/lib/libgtkmm-2.4.so.1
#11 0x08294935 in sp_canvas_paint_rect_internal
(canvas=0x85fb148, rect=<value optimized out>,
x_aborted_limit=0x0, y_aborted_limit=0x0) at
display/sp-canvas.cpp:1678
#12 0x08294cc0 in sp_canvas_paint_rect
(canvas=0x85fb148, xx0=-197, yy0=-608, xx1=544, yy1=96)
at display/sp-canvas.cpp:1812
#13 0x08294526 in do_update (canvas=0x85fb148) at
display/sp-canvas.cpp:1988
#14 0x08111892 in sp_document_maybe_done
(doc=0x8670fa0, key=0x8475e9d "fillstroke:blur",
event_type=151, event_description=@0xbfb5d188)
    at /usr/include/sigc++-2.0/sigc++/signal.h:544
#15 0x081e7cef in sp_fillstroke_blur_changed
(a=0x9ef6f80, dlg=0x8ac0738) at
dialogs/object-properties.cpp:421
#16 0xb747b4f8 in IA__g_cclosure_marshal_VOID__VOID
(closure=0xb05d108, return_value=0x0, n_param_values=1,
param_values=0xbfb5d450, invocation_hint=0xbfb5d2f8, 
    marshal_data=0x81e7b40) at gmarshal.c:77
#17 0xb746d492 in IA__g_closure_invoke
(closure=0xb05d108, return_value=0x0, n_param_values=1,
param_values=0xbfb5d450, invocation_hint=0xbfb5d2f8) at
gclosure.c:490
#18 0xb747f3e6 in signal_emit_unlocked_R
(node=0x867f188, detail=0, instance=0x9ef6f80,
emission_return=0x0, instance_and_params=0xbfb5d450) at
gsignal.c:2440
#19 0xb7480469 in IA__g_signal_emit_valist
(instance=0x9ef6f80, signal_id=122, detail=0,
var_args=<value optimized out>) at gsignal.c:2199
#20 0xb7480720 in IA__g_signal_emit
(instance=0x9ef6f80, signal_id=122, detail=0) at
gsignal.c:2243
#21 0xb765396e in IA__gtk_adjustment_value_changed
(adjustment=0x9ef6f80) at gtkadjustment.c:363
#22 0xb7653c13 in IA__gtk_adjustment_set_value
(adjustment=0x9ef6f80, value=20.231999999999999) at
gtkadjustment.c:346
#23 0xb77bcbc8 in IA__gtk_spin_button_update
(spin_button=0xa52b0d0) at gtkspinbutton.c:2230
#24 0xb77be579 in gtk_spin_button_focus_out
(widget=0xa52b0d0, event=0x8ad66e8) at gtkspinbutton.c:946
#25 0xb7749f6d in _gtk_marshal_BOOLEAN__BOXED
(closure=0x858fca0, return_value=0xbfb5d82c,
n_param_values=2, param_values=0xbfb5d9a0,
invocation_hint=0xbfb5d848, 
    marshal_data=0xb77be533) at gtkmarshalers.c:84
#26 0xb746b869 in g_type_class_meta_marshal
(closure=0x858fca0, return_value=0xbfb5d82c,
n_param_values=2, param_values=0xbfb5d9a0,
invocation_hint=0xbfb5d848, marshal_data=0xe4)
    at gclosure.c:567
#27 0xb746d492 in IA__g_closure_invoke
(closure=0x858fca0, return_value=0xbfb5d82c,
n_param_values=2, param_values=0xbfb5d9a0,
invocation_hint=0xbfb5d848) at gclosure.c:490
#28 0xb747f5dd in signal_emit_unlocked_R
(node=0x8601b00, detail=0, instance=0xa52b0d0,
emission_return=0xbfb5d98c,
instance_and_params=0xbfb5d9a0) at gsignal.c:2478
#29 0xb74804d9 in IA__g_signal_emit_valist
(instance=0xa52b0d0, signal_id=53, detail=0,
var_args=<value optimized out>) at gsignal.c:2209
#30 0xb7480720 in IA__g_signal_emit
(instance=0xa52b0d0, signal_id=53, detail=0) at
gsignal.c:2243
#31 0xb7876846 in gtk_widget_event_internal
(widget=0xa52b0d0, event=0x8ad66e8) at gtkwidget.c:3911
#32 0xb787be2a in IA__gtk_widget_event
(widget=0xa52b0d0, event=0x8ad66e8) at gtkwidget.c:3717
#33 0xb7885951 in do_focus_change (widget=0xa52b0d0,
in=0) at gtkwindow.c:4783
#34 0xb7886344 in gtk_window_real_set_focus
(window=0x8ac0738, focus=0xa11c8b0) at gtkwindow.c:4985
#35 0xb747b65c in IA__g_cclosure_marshal_VOID__OBJECT
(closure=0x8603c18, return_value=0x0, n_param_values=2,
param_values=0xbfb5dee0, invocation_hint=0xbfb5dd88, 
    marshal_data=0xb78861c8) at gmarshal.c:636
#36 0xb746b869 in g_type_class_meta_marshal
(closure=0x8603c18, return_value=0x0, n_param_values=2,
param_values=0xbfb5dee0, invocation_hint=0xbfb5dd88,
marshal_data=0x1a0)
    at gclosure.c:567
#37 0xb746d492 in IA__g_closure_invoke
(closure=0x8603c18, return_value=0x0, n_param_values=2,
param_values=0xbfb5dee0, invocation_hint=0xbfb5dd88) at
gclosure.c:490
#38 0xb747f5dd in signal_emit_unlocked_R
(node=0x8680340, detail=0, instance=0x8ac0738,
emission_return=0x0, instance_and_params=0xbfb5dee0) at
gsignal.c:2478
#39 0xb7480469 in IA__g_signal_emit_valist
(instance=0x8ac0738, signal_id=104, detail=0,
var_args=<value optimized out>) at gsignal.c:2199
#40 0xb7480720 in IA__g_signal_emit
(instance=0x8ac0738, signal_id=104, detail=0) at
gsignal.c:2243
#41 0xb788d5bd in _gtk_window_internal_set_focus
(window=0x8ac0738, focus=0xa11c8b0) at gtkwindow.c:1274
#42 0xb78840d7 in gtk_widget_real_grab_focus
(focus_widget=0xa11c8b0) at gtkwidget.c:4297
#43 0xb747b4f8 in IA__g_cclosure_marshal_VOID__VOID
(closure=0x8590228, return_value=0x0, n_param_values=1,
param_values=0xbfb5e3b0, invocation_hint=0xbfb5e258, 
    marshal_data=0xb7883f1e) at gmarshal.c:77
#44 0xb746b869 in g_type_class_meta_marshal
(closure=0x8590228, return_value=0x0, n_param_values=1,
param_values=0xbfb5e3b0, invocation_hint=0xbfb5e258,
marshal_data=0xa4)
    at gclosure.c:567
#45 0xb746d492 in IA__g_closure_invoke
(closure=0x8590228, return_value=0x0, n_param_values=1,
param_values=0xbfb5e3b0, invocation_hint=0xbfb5e258) at
gclosure.c:490
#46 0xb747f5dd in signal_emit_unlocked_R
(node=0x8590440, detail=0, instance=0xa11c8b0,
emission_return=0x0, instance_and_params=0xbfb5e3b0) at
gsignal.c:2478
#47 0xb7480469 in IA__g_signal_emit_valist
(instance=0xa11c8b0, signal_id=35, detail=0,
var_args=<value optimized out>) at gsignal.c:2199
#48 0xb7480720 in IA__g_signal_emit
(instance=0xa11c8b0, signal_id=35, detail=0) at
gsignal.c:2243
#49 0xb787b3ca in IA__gtk_widget_grab_focus
(widget=0xa11c8b0) at gtkwidget.c:4216
---Type <return> to continue, or q <return> to quit---
#50 0xb778f780 in gtk_range_button_press
(widget=0xa11c8b0, event=0x9bbd680) at gtkrange.c:1568
#51 0xb7749f6d in _gtk_marshal_BOOLEAN__BOXED
(closure=0x85904c8, return_value=0xbfb5e73c,
n_param_values=2, param_values=0xbfb5e8b0,
invocation_hint=0xbfb5e758, 
    marshal_data=0xb778f72e) at gtkmarshalers.c:84
#52 0xb746b869 in g_type_class_meta_marshal
(closure=0x85904c8, return_value=0xbfb5e73c,
n_param_values=2, param_values=0xbfb5e8b0,
invocation_hint=0xbfb5e758, marshal_data=0xb0)
    at gclosure.c:567
#53 0xb746d492 in IA__g_closure_invoke
(closure=0x85904c8, return_value=0xbfb5e73c,
n_param_values=2, param_values=0xbfb5e8b0,
invocation_hint=0xbfb5e758) at gclosure.c:490
#54 0xb747f5dd in signal_emit_unlocked_R
(node=0x8600aa8, detail=0, instance=0xa11c8b0,
emission_return=0xbfb5e89c,
instance_and_params=0xbfb5e8b0) at gsignal.c:2478
#55 0xb74804d9 in IA__g_signal_emit_valist
(instance=0xa11c8b0, signal_id=39, detail=0,
var_args=<value optimized out>) at gsignal.c:2209
#56 0xb7480720 in IA__g_signal_emit
(instance=0xa11c8b0, signal_id=39, detail=0) at
gsignal.c:2243
#57 0xb7876846 in gtk_widget_event_internal
(widget=0xa11c8b0, event=0x9bbd680) at gtkwidget.c:3911
#58 0xb787be2a in IA__gtk_widget_event
(widget=0xa11c8b0, event=0x9bbd680) at gtkwidget.c:3717
#59 0xb7742715 in IA__gtk_propagate_event
(widget=0xa11c8b0, event=0x9bbd680) at gtkmain.c:2188
#60 0xb77439f6 in IA__gtk_main_do_event
(event=0x9bbd680) at gtkmain.c:1407
#61 0xb75b6612 in gdk_event_dispatch (source=0x857b0e8,
callback=0, user_data=0x0) at gdkevents-x11.c:2320
#62 0xb73f3576 in IA__g_main_context_dispatch
(context=0x857b130) at gmain.c:2045
#63 0xb73f5f82 in g_main_context_iterate
(context=0x857b130, block=1, dispatch=1,
self=0x85d71a0) at gmain.c:2677
#64 0xb73f629c in IA__g_main_loop_run (loop=0x89cc308)
at gmain.c:2881
#65 0xb7743e16 in IA__gtk_main () at gtkmain.c:1001
#66 0xb7d9a147 in Gtk::Main::run_impl () from
/usr/lib/libgtkmm-2.4.so.1
#67 0xb7d99f32 in Gtk::Main::run () from
/usr/lib/libgtkmm-2.4.so.1
#68 0x08076f48 in sp_main_gui (argc=2, argv=0xbfb5ee04)
at main.cpp:654
#69 0x0816b8d3 in
Inkscape::NSApplication::Application::run
(this=0xbfb5ed44) at application/application.cpp:117
#70 0x0807744b in main (argc=2, argv=0xbfb5ee04) at
main.cpp:489