Exporting slice in SVG respects hidden rectangle's size, not its area

[Set Hallstrom]

When exporting to plain-svg, inkscape respects the size of the slice-rectangle, but not the area.

Steps to reproduce:
1.) Draw a shape
2.) Add a layer on top, name it export
3.) Draw a rectangle over the shape drawn in step 1.)
4.) Give shape ID-name: "slice-ID"
5.) save the file as inputfile.svg
6.) in the terminal, type the following command:
inkscape --export-id=slice-ID --export-plain-svg=slice-ID.svg inputfile.svg

expected result:
slice-ID.svg has the size of the slice-rectangle and the shape drawn in step 1.) is positioned in it as expected.

result: slice-ID.svg has the size of the slice-rectangle but the shape drawn in step 1.) is _not_ positioned in it as expected.

(On a side note, feel free to read my bug report as a wish for plain-SVG support in the "export" window with the same "Batch-export" check box as for PNGs.)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: inkscape 0.91-7ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-36.55-lowlatency 4.4.16
Uname: Linux 4.4.0-36-lowlatency x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Aug 31 23:52:58 2016
InstallationDate: Installed on 2016-04-21 (132 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: inkscape
UpgradeStatus: No upgrade log present (probably fresh install)

[victorialily (victorialily)]

Bug Description very nice explained

[jazzynico (jazzynico)]

Reproduced on Windows 7, lp:inkscape/0.92.x rev. 15067.

Original and exported files attached.

[su_v (suv-lp)]

Same as bug #1306662?