The content of hidden text fields is printed and exported to PDF when the option
Formatting aids - Display of - Fields: Hidden text is set, even if they should
be hidden (condition is true).

How to reproduce:
1. Have some text and mark a portion of it.
2. Insert -> Fields -> Other... -> Functions - Type: Hidden text - Condition:
"TRUE". Click Insert (and Close).
3. In Tools -> Options... -> OOo Writer -> Formatting Aids, section Display of,
check the option "Fields: Hidden Text". Click OK.
4. Hidden text is now displayed (grey, if field shadings are activated), even
though condition "TRUE" is always true (which is OK).
5. Check with File -> Page preview: Hidden text is not displayed (which is OK, too).
6. Close the preview, print the document, and export it to PDF.

Expected: Hidden text fields do not appear in the paper print, nor in the PDF
file (= as the preview).
Seen: Hidden text fields are printed and exported to PDF, even when condition is
true.

Double-check: In Tools -> Options... -> OOo Writer -> Formatting Aids, section
Display of, now uncheck the option "Fields: Hidden Text", and print again:
hidden text fields are not printed (nor included into a PDF).

OOo 2.3.0 (B9221) and OOo 680_m231 under Linux (both RPM, and both de_DE and
en_US), OOo 2.3.0 (B9221) under Win2000 (de_DE).