bug#26978: 25.2; incomplete display of SVG image

[Eli Zaretskii <eliz@gnu.org>]

> From: ynyaaa@gmail.com
> Cc: 26978@debbugs.gnu.org
> Date: Thu, 18 May 2017 19:02:18 +0900
> 
> The attached tgz file contains
>   test-svg/appearance-abc.png
>   test-svg/appearance-png.png
>   test-svg/appearance-subdir.png
>   test-svg/emacs.png
>   test-svg/sample-abc.svg
>   test-svg/sample-png.svg
>   test-svg/subdir/sample-subdir.svg
> 
> test-svg/appearance-*.png are screen shots when viewing SVG files
> by C-x C-f.
> 
> test-svg/appearance-abc.png is for test-svg/sample-abc.svg
> (three rectangles instead of "ABC").

This most probably means you don't have some font installed.  On my
system, this file displays correctly.

> test-svg/appearance-png.png is for test-svg/sample-png.svg
> (a scaled emacs icon, expected image).
> 
> test-svg/appearance-subdir.png is for test-svg/subdir/sample-subdir.svg
> (a blue square without the emacs icon, unexpected image).
> 
> Type C-x C-f test-svg/sample-png.svg
> and evaluate (setq buffer-file-name nil)
> and type C-c C-c C-c C-c(image-toggle-display twice),
> then the image looks same as test-svg/appearance-subdir.png.

This one displays fine on one system I tried, but not on another.  So
I think it's some subtle problem with librsvg.