Spurious shadow under text

[automatedbugreportingfacility]

This is a regression from PR #4521. There's a grey shadow under 45°.

URL: http://www.leics.gov.uk/sd34.pdf
1.1.215: https://i.imgur.com/s20TmMU.png
0.8.990: https://i.imgur.com/kaOooD2.png

7e7b728 is the first bad commit
commit 7e7b728
Author: Jonas Jenwald
Date: Wed Mar 26 22:29:04 2014 +0100

Assign non-zero width/height to all rectangles (issue 4260)

[Snuffleupagus]

Actually, there seems to be more to this issue than just a regression.
Comparing the rendering in PDF.js just prior to PR #4521 with Adobe Reader, it seems that there is more going on here. As can be seen in the following screen-shot, it appears that in Adobe Reader the area behind 45° is actually filled with white, whereas in PDF.js it was semitransparent:

[yurydelendik]

Screenshot from mac osx preview:

And reader on mac osx (@400%):

[yurydelendik]

Removing regression tag, since the Adobe Reader and Mac OSX Preview has the similar issue.

[Snuffleupagus]

Fixed by PR #12812