Crash checking/unchecking CSS style in CSS & Selectors Dialog

Summary:

When unchecking or checking a declaration in the CSS dialog, Inkscape crashes.

Steps to reproduce:

• open Inkscape
• open mdn.svg (abridged from MDN)
• click the first selector in the Selectors and CSS dialog
• uncheck the font-size attribute

What happened?

Crash:

Click to expand

 0# boost::stacktrace::basic_stacktrace >::init(unsigned long long, unsigned long long) in libinkscape_base
 1# Inkscape::Application::crash_handler(int) in libinkscape_base
 2# 0x00007FF7447D2152 in inkscape
 3# _C_specific_handler in ntdll
 4# _chkstk in ntdll
 5# _RtlRaiseException in ntdll
 6# _KiUserExceptionDispatcher in ntdll
 7# _gtk_cell_layout_get_area in libgtk_3_0
 8# _gtk_tree_view_convert_widget_to_bin_window_coords in libgtk_3_0
 9# _g_closure_invoke in libgobject_2_0_0
10# _g_signal_emit_valist in libgobject_2_0_0
11# _g_signal_emit in libgobject_2_0_0
12# _gtk_gesture_long_press_new in libgtk_3_0
13# _g_cclosure_marshal_VOID__BOXEDv in libgobject_2_0_0
14# _g_closure_invoke in libgobject_2_0_0
15# _g_signal_emit_valist in libgobject_2_0_0
16# _g_signal_emit in libgobject_2_0_0
17# _gtk_glade_catalog_init in libgtk_3_0
18# _gtk_gesture_handles_sequence in libgtk_3_0
19# _gtk_gesture_rotate_get_angle_delta in libgtk_3_0
20# _gtk_event_controller_handle_event in libgtk_3_0
21# _gtk_requisition_free in libgtk_3_0
22# Gtk::Widget::on_button_press_event(_GdkEventButton*) in libgtkmm_3_0_1
23# Gtk::Widget_Class::button_press_event_callback(_GtkWidget*, _GdkEventButton*) in libgtkmm_3_0_1
24# 0x00007FFE15342F94 in libgtk_3_0
25# _g_closure_invoke in libgobject_2_0_0
26# _g_signal_emit_valist in libgobject_2_0_0
27# _g_signal_emit in libgobject_2_0_0
28# _gtk_requisition_copy in libgtk_3_0
29# _gtk_lock_button_set_permission in libgtk_3_0
30# _gtk_main_do_event in libgtk_3_0
31# _gdk_event_free in libgdk_3_0
32# _gdk_win32_drag_context_get_type in libgdk_3_0
33# _g_clear_list in libglib_2_0_0
34# _g_main_context_check in libglib_2_0_0
35# _g_main_context_iteration in libglib_2_0_0
36# _g_application_run in libgio_2_0_0
37# 0x00007FF7447D3BF6 in inkscape
38# 0x00007FF7447D12EE in inkscape
39# 0x00007FF7447D13E6 in inkscape
40# _BaseThreadInitThunk in KERNEL32
41# _RtlUserThreadStart in ntdll

What should have happened?

The declaration is disabled.

Sample attachments:

Version info

Inkscape 1.3-beta (b54b51506c, 2023-07-12, custom)

    GLib version:     2.76.1
    GTK version:      3.24.38
    glibmm version:   2.66.6
    gtkmm version:    3.24.7
    libxml2 version:  2.10.3
    libxslt version:  1.1.37
    Cairo version:    1.17.8
    Pango version:    1.50.14
    HarfBuzz version: 7.1.0

    OS version:       Windows 10 22H2