Each PDF exports contains white pixel in the middle of PDF !

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Generate empty image, \fill[black] (0,0) rectangle (2,2);
2. In preview and in saved PDF a white pixel becomes visible in most 
PDF-Engines, most important in Acrobat Reader.
3. See attached file New Tikzfile.pdf with Acrobat Reader.

What is the expected output? What do you see instead?
Expected: Black square.
Instead: Black square with overlaying white pixels.

For compilation problems: What is the error pdflatex reports? You find the
latex output in the textbox at the bottom of the TikzEdt main window. (You
can switch between Status/Latex output/Error list.)
-

What operating system and Latex distribution (Miktex/Texlive) are you
using?

Win 7 / Win 8 with MikTex 2.9.5

Please provide any additional information below.

In my opinion, the pixel stems from the <file>.tex.preview.tex where a 
node[...draw=white] is inserted at the (current bounding box) position. 
Unfortunately, the extension inserted into this .tex are not editable - so 
there is no way to get rid of it :(

Original issue reported on code.google.com by theloozi...@gmail.com on 4 Mar 2015 at 9:35

Attachments:

• [New Tikzfile.pdf](https://storage.googleapis.com/google-code-attachments/tikzedt/issue-74/comment-0/New Tikzfile.pdf)
• [New Tikzfile.tex](https://storage.googleapis.com/google-code-attachments/tikzedt/issue-74/comment-0/New Tikzfile.tex)
• [New Tikzfile.tex.preview.tex](https://storage.googleapis.com/google-code-attachments/tikzedt/issue-74/comment-0/New Tikzfile.tex.preview.tex)
• Screenshot.png