Assigning SVG bugs to Ariel -- need a cleanup pass to see what's fixed up by a librsvg upgrade, what can be resolved with fixes to our font configuration, what can be fixed on our end, and what still needs to be pushed upstream.

Updated URL of the test case, the original page was deleted in the meantime

Here is another example http://en.wikipedia.org/wiki/File:Passband_schematic2.svg. It is not the current image that is problematic, it is the previous one in the file history. It can be seen that the thumbnail in the history bears no relation to this [http://en.wikipedia.org/wiki/File:Passband_schematic3.png png of the same image]. If the svg is uploaded, however, it has all the original details. It will also render correctly if set to a large size.

giving SVG bugs back to the pool.

Issue still exists after recent librsvg update

The rendering of this image has improved significantly. It seems there is now only a problem with the 'density' of the pattern.

https://test.wikipedia.org/wiki/Bug_18463 still has the described problems.

another example small: https://upload.wikimedia.org/wikipedia/commons/thumb/archive/4/40/20140917233735%21SMirC-devil.svg/27px-SMirC-devil.svg.png

black teeth of [[File:SMirC-devil.svg]]

I found another cause and so workaround fix (in file). If patterns are cloned (in the defs-element) and the original pattern comes after the clone librsvg can't handle this (which seems not good SVG code but seems no violation).
Example shown before my (file) fix here: File: Grundriss_Burg_Hageneck.svg

In T20463#1447768, @Perhelion wrote:

I found another cause and so workaround fix (in file). If patterns are cloned (in the defs-element) and the original pattern comes after the clone librsvg can't handle this

@Perhelion: Do you know if this is already reported to the librsvg maintainer(s) in https://bugzilla.gnome.org/buglist.cgi?resolution=---&product=librsvg ?

@Aklapper
Unfortunately no (I found still no corresponding bug-report there).

Compared to https://test.wikipedia.org/wiki/Bug_18463 and the thumbnails available from https://commons.wikimedia.org/wiki/File:Segments_racleurs_piston-fr.svg?uselang=az , I see different (and more usable results) results locally with librsvg2-2.44.13 (newer than on Wikimedia servers) depending on the zoom:

file	old	new
https://commons.wikimedia.org/wiki/File:Segments_racleurs_piston-fr.svg
https://commons.wikimedia.org/wiki/File:Hidrograf%C3%ADa_Galicia_Cunca_Mari%C3%B1a_Oriental_mudo.svg	{F37007182}	{F37007181}

both not correct