[REVIEW] fix for fdo#46230, shrink the copy area only in the text export

[Markus Mohrhard]

Hey,

[1] fixes the problem that drag and drop did not work correctly in
calc. The problem is that we should not shrink the area already in
ScTransferObj. We should wait until we need to export the data and
limit this to the text export. Please test it especially in the
context of n#677811.

Regards,
Markus

[1] http://cgit.freedesktop.org/libreoffice/core/commit/?id=2a26fe4a39b6f3b2af269b801340c32c28806250