[LyX/2.3.x] Fix bug #11180

[Enrico Forestieri]

On Fri, Sep 25, 2020 at 01:06:03AM -0400, Scott Kostyshak wrote:
> On Thu, Oct 04, 2018 at 06:48:12AM +0200, Richard Kimberly Heck wrote:
> > commit ea81faa911fc2561a017eb36c3a3d0bbe5b86756
> > Author: Enrico Forestieri <forenr at lyx.org>
> > Date:   Sun Jun 24 20:06:40 2018 +0200
> > 
> >     Fix bug #11180
> >     
> >     When a raster image with an advertised pixel density different
> >     from 72 dpi is included in a latex file, the output image dimensions
> >     are scaled by the ratio 72/pixel_density. Hence, if a clipping
> >     bounding box is specified, it has to be scaled by the same ratio,
> >     otherwise the images will be clipped differently on screen and output.
> >     Here we use the extractbb command (present in any TeX distribution)
> >     to ask about the output dimensions of the image as dictated by the
> >     pixel density and compute the scaling ratio by the knowledge of the
> >     actual dimensions. If, for whatever reason, extractbb is not found,
> >     everything goes as before, because the clipping bounding box will
> >     simply not be corrected.
> >     
> >     (cherry picked from commit 380f34a11485c41d812695dc4279b24a5ed5cc07)
> > ---
> 
> A bisect on 2.3.x lead me here. I see the same behavior on master. To
> reproduce, download the attached files and open the .lyx file and view
> as PDF (pdflatex). The image is clipped differently than before this
> commit. Strangely, if I export on the command line (with -e pdf2),
> things work as before.

I think it was an oversight. The clipping bounding box should not be
corrected for all vector formats, not only postscript. Fixed at 9b1763cd.
Riki, this is also needed in stable.

-- 
Enrico