Allow copy-paste of formatting inside a text object

Summary:

At present, Ctrl+Shift+V can be used to paste the formatting from one object to another. However, this does not work for spans of text inside a text object.

Steps to reproduce:

• Open Inkscape.
• Create a text object and write the words “Foo Bar Baz”.
• Select the word “Bar” and give it some deviant formatting, e.g. fill, stroke, italic, etc.
• Press Ctrl+C to copy the selected span containing the newly formatted word “Bar”.
• Create another text object and write the words “Snap Crackle Pop”.
• Select the word “Crackle”.
• Press Ctrl+Shift+V.

What happened?

It pastes the overall formatting of the original text object, not the specially-formatted “Bar” span.

What should have happened?

It should paste the formatting of the “Bar” span.

Version info

Inkscape 1.4.2 (f4327f4, 2025-05-13)

                      Compile  (Run)
    GLib version:     2.84.0
    GTK version:      3.24.49 (3.24.49)
    glibmm version:   2.66.7
    gtkmm version:    3.24.9
    libxml2 version:  2.12.10
    libxslt version:  1.1.43
    Cairo version:    1.18.4 (1.18.4)
    Pango version:    1.56.3 (1.56.3)
    HarfBuzz version: 10.4.0 (10.4.0)

    OS version:       Windows 10 22H2