Crafted preferences.xml makes SVG Input dialog constantly appear

Summary:

With the attached preferences.xml and an otherwise fresh config, Inkscape pops up this modal SVG Input dialog on virtually every operation.

image

It appears on startup, when a new window is opened, and even on selecting different objects. Furthermore, clicking Cancel crashes Inkscape skipping the crash handler dialog.

Steps to reproduce:

  • Overwrite preferences.xml with the attached file.
  • Open Inkscape

What happened?

Inkscape pops up the SVG Input dialog. It originates from this backtrace,

3   g_main_loop_run                                                                                                                        (x86_64) /usr/lib/libglib-2.0.so.0      0x7ffff4f39d8f 
4   gtk_dialog_run                                                                                                                         gtkdialog.c                        1398 0x7ffff791eaa7 
5   Inkscape::Extension::Extension::prefs()                                                                                                extension.cpp                      1122 0x7ffff688c0ba 
6   Inkscape::Extension::open(Inkscape::Extension::Extension *, const char *)                                                              system.cpp                         122  0x7ffff6890a1e 
7   ink_file_open(Glib::RefPtr<Gio::File> const&, bool *)                                                                                  file.cpp                           100  0x7ffff695ce7e 
8   Inkscape::load_document(const char *)                                                                                                  svg-renderer.cpp                   52   0x7ffff6b765c4 
9   Inkscape::svg_renderer::svg_renderer(const char *)                                                                                     svg-renderer.cpp                   55   0x7ffff6b7664a 
10  Inkscape::UI::Widget::MarkerComboBox::MarkerComboBox(Glib::ustring, int)                                                               marker-combo-box.cpp               120  0x7ffff6f78b88

So while populating the markers combo box, specifically while loading share/inkscape/ui/bad-marker.svg, the dialog is created. Clicking Cancel throws an uncaught exception in a signal handler, which crashes.

What should have happened?

It shouldn't be possible to get Inkscape into this state. The preferences file that causes this behaviour originated simply from testing the command palette, so in theory this situation can occur just by performing everyday operations.

Sample attachments:

preferences.xml

Version info

Both 1.2.2 and 1.3-dev on Arch Linux.