some pages converted into viewbox when we do undo after delete.

Summary:

• when we do undo after delete the pages, some pages converted into viewbox.

Steps to reproduce:

• open Inkscape
• create 10 pages.
• select random page (ex. 6) and delete the all pages.
• switched to selection tool.
• now, switch back to page tool.
• now, do undo (ctrl+z).
• some random pages will converted into viewbox.

What happened?

• some random pages will converted into viewbox.

What should have happened?

• pages shouldn't converted into viewbox.

Sample attachments:

Kooha-01-04-2022-14-53-29

Version info

Inkscape 1.2-dev (105abf2beb, 2022-01-04)

    GLib version:     2.70.2
    GTK version:      3.24.31
    glibmm version:   2.66.2
    gtkmm version:    3.24.5
    libxml2 version:  2.9.12
    libxslt version:  1.1.34
    Cairo version:    1.17.4
    Pango version:    1.50.3
    HarfBuzz version: 3.2.0

    OS version:       Arch Linux