Accept new file name from the command line

Summary:

(this is an enhancement request for command-line users)

New file names should be accepted from the command line. For example, I can do "vim new_file.txt" even when "new_file.txt" does not exist yet, but not "inkscape new_file.svg". This can be especially useful when starting inkscape from some deep subdirectory, or when I know the file name beforehand.

Steps to reproduce:

run "inkscape new_file.svg" from the shell command line.

What happened?

inkscape complains that "new_file.svg" does not exist:

ink_file_open: '/home/kas/new_file.svg' cannot be opened!
InkscapeApplication::document_open: Failed to open: /home/kas/new_file.svg
ConcreteInkscapeApplication::on_open: failed to create document!

What should have happened?

inkscape should start with new document and preselected file name (and of course, the directory).

Debug info

Inkscape 1.1 (c68e22c387, 2021-05-23)

    GLib version:     2.68.2
    GTK version:      3.24.29
    glibmm version:   2.66.1
    gtkmm version:    3.24.5
    libxml2 version:  2.9.12
    libxslt version:  1.1.34
    Cairo version:    1.17.4
    Pango version:    1.48.5
    HarfBuzz version: 2.7.4
    Poppler version:  21.01.0

    OS version:       Fedora 34 (Thirty Four)

Thanks in advance for considering this request.