Public bug reported:

Since 1.12.3, cairo cannot render fine lines to pdf. 1.12.2 was the last
version that worked.

http://cgit.freedesktop.org/cair/diff/?id=bdf83008f4b2c723fd8e65e2a92bc47a2e7bc442

introduced code to avoid lines that would be invisible when rasterized.
While this is a valid logic for raster backends, it is a bad idea for
PDF output. There we want to see all fine lines.

My specific use case is generating a lasercutter drawing for an Epilog
Zing laser with inkscape. There the hardware would raster anything
thicker than 0.02mm, and cut 0.01mm or below. 1.12.3 skips lines below
0.036mm, 1.13.1 skips lines below 0.018mm -- which is still not enough
to safely drive my lasercutter.

Previously reported against inkscape:
https://bugs.launchpad.net/inkscape/+bug/1174909

Also reported agains cairo upstream with a suggested fix: 
https://bugs.freedesktop.org/show_bug.cgi?id=77298
Check out the attached reproducer and fix.

I'd suggest to circulate patched ubuntu packages, until upstream
releases an official fix.

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

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https://bugs.launchpad.net/bugs/1306846

Title:
  Inkscape (using cairo) fails to print thin lines to PDF

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