Objects displaced after save (3D boxes)

[Bart Van Audenhove]

- I created a drawing containing a few 3D boxes and other objects
- I made a lot of changes (to locations of objects, sizes, colors, layers,...), saving and opening the file various times, all went well
- but at some point, when opening the last saved file, the 3D boxes had been displaced down without apparent reason (simple displacement as objects, not "perspective" displacement as 3D boxes) - see attached screenshot bug_displacement_error.png
- strangely, selecting the 3D boxes and pressing the up arrow once makes them "jump" immediately to the right place (instead of moving them up a bit as would be expected) - see attached screenshot bug_displacement_correct.png

Attached also the SVG with the problem.

Inkscape 0.91 (synaptic says: 0.91.0+47~ubuntu14.04.1) on Ubuntu 14.04.1

[su_v (suv-lp)]

Reproduced with Inkscape 0.91 r13725 on OS X 10.7.5 depending on how the document is opened:
- not reproduced if opened in a new document window
- reproduced if a document window is reused [1]; the correct position is restored if the document is then reloaded via 'File > Revert'

TODO: search existing reports for similar symptoms with 3dboxes - possibly related to the transformation of 'Layer 1' - transform="translate(0,-308.26772)".

<off-topic>
Console message when opening the file:
** (inkscape:32575): WARNING **: Parent of 3D box side is not a 3D box.

Tip: if you want to modify 3dboxes as regular objects (i.e. a group of paths) to e.g. cut one 3dbox face from the group and place it elsewhere on a separate layer, I would recommend to convert the object '3dbox' to path first (menu 'Object > Object to Path'), otherwise the custom 3dbox-related attributes stored with the object (polygon) might interfere with later actions.

Note that - as with any other object (rectangle, ellipse/circle, text, offsets, etc. - 3dboxes converted to path lose the parametric qualities and cannot be edited anymore based on the original object's 3d perspective information, nor can this conversion be reverted.
</off-topic>

--
[1] launch inkscape by itself, open document from within inkscape while the initial document window is not dirty (no changes -> document window will get reused to load the file).

[Bart Van Audenhove (bart-vanaudenhove)]

Here another file with the same problem. Interestingly, the problem (3dbox displaced) does not occur when opening the file from command line ("inkscape filename") or by selecting the file in File Manager and right-click -> "Open with: Inkscape". The problem only occurs when I first launch Inkcape (empty document), then open the file (File > Open).

Inkscape 0.91 on Ubuntu 15.04.

(Note: The attached file was a lot complexer and has been stripped of all other elements except the 3dbox. The displacement of the 3Dbox occurred only after many changes and saving/closing/opening of the original, complex drawing).

[jazzynico (jazzynico)]

Likely related to (or duplicate of) bug #1235369 "3dboxes created with 0.48 displaced on load (rev >= 10466)"
<https://bugs.launchpad.net/inkscape/+bug/1235369>