Public bug reported:

When converting state outline data, I found that for various states that
inkscape would perform an unauthorized partial fill of the outline at
various zoom levels, especially low zoom levels.   This was seen for all
states combined and for individual state files.

Looks like a classic case of a rasterization/fill algorithm being
confused counting edges by minute details but why is such an algorithm
even running on unfilled region?

What happens if you actually try to fill is an exercise for the reader.

One such state outline is attached.

Converted using: http://www.carto.net/svg/utils/shp2svg/

Original data from: http://www.census.gov/geo/www/cob/st2000.html

wget http://www.census.gov/geo/cob/bdy/st/st00shp/st51_d00_shp.zip
 ./ogis2svg.pl --input st51_d00.shp --output virginia.svg --roundval 0.000001 
--outputunits mm <<\...EOF...
y
y
y
y
y
y
y
y
y
y
y
none
y
name
y
a

n
...EOF...
inkscape virginia.svg &

To see the same error on multiple states, use the st99 file.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: inkscape 0.48.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CheckboxSubmission: 1e1a99f31ec2933306456e1f141c45d8
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Wed Dec 14 23:34:48 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: inkscape
UpgradeStatus: Upgraded to oneiric on 2011-11-09 (35 days ago)

** Affects: inkscape (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/904580

Title:
  spurious horizontal fill lines on unfilled polygons at low zoom levels

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