There are two slighly different scenarios where I have problems with the above
assertion while streaming a GDIMetaFile to SvStream:

1)
a) Open an impress or draw
b) create a text shape with font 'Times New Roman' or 'Arial' for example.
c) Export the selected text shape as svm file
-> ASSERTION: Error: File string.c, Line 240

The assertion comes up because the given text encoding for
rtl_impl_convertUStringToString does not fulfill 'rtl_isOctetTextEncoding'
In the above example the textencoding is 65535.

2) While creating the ole object visual representation for the new chart I run
into the same assertion with a text encoding 9 which was set via uno api.
Moreover this new encoding is transported from the one MetaTextArrayAction to
all following actions in the while loop in method vcl/../gdimtf.cxx 'SvStream&
GDIMetaFile::Write( SvStream& rOStm )'. This might be worse?...


Call stacks attached.