Clone image in pdf not reused
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#### Steps to reproduce:
<!-- Describe what you did (step-by-step) so we can reproduce: -->
- import an image
- save a pdd and note the size (let's say 1MB)
- clone 9 times the image (image is in total 10 times in the document)
- save another pdf and note the size
#### What happened?
The second pdf weighs 10MB. The image is not reused.
#### What should have happened?
Using XObject, the image data should be reused and not duplicated. The final size should be 1MB.
#### Inkscape Version and Operating System:
Inkscape 1.4.3 (0d15f75, 2025-12-25)
Compile (Run)
GLib version: 2.86.3
GTK version: 3.24.51 (3.24.51)
glibmm version: 2.66.8
gtkmm version: 3.24.10
libxml2 version: 2.15.1
libxslt version: 1.1.45
Cairo version: 1.18.4 (1.18.4)
Pango version: 1.56.4 (1.56.4)
HarfBuzz version: 12.2.0 (12.2.0)
OS version: Windows 11 25H2
{width=464 height=600}
In the attached file, the SVG is 4MB, the exported PDF is 70MB.
issue