rects/circles/text not exported on save as Synfig (.sif)
#### Steps to reproduce: - Open Inkscape - Open ![non-paths.svg](/uploads/6df16f64fc61f62081080d619c7140cd/non-paths.svg) - Save as Synfig (.sif) #### What happened? File is blank, ``` <canvas version="0.5" width="456.322866" height="222.027092" xres="2834.645752" yres="2834.645752" view-box="-3.802691 1.850226 3.802691 -1.850226"> <name>non-paths.sif</name> </canvas> ``` #### What should have happened? Elements are exported correctly. I'm not sure about the correctness of the file (I don't use synfig), but something does export with Inkscape 0.92.4 (8da668285a, 2020-02-28) [non-paths92.sif](/uploads/f24a8cd724e31dff9b41c38798a23664/non-paths92.sif) First reported in https://gitlab.com/inkscape/inbox/-/issues/2040 #### Inkscape Version and Operating System: - 1\.1-dev (inkscape@0b728ebfcbffb9048f1b761cb44fb67f4b1a0535, 2020-03-15), extensions head at 1b5cc38a with Linux Mint 19.1
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