trunk: text-flowed-into-frame displaced on load (rev >= 13700)

Variant A:
1) launch current trunk
2) open attached test case (originally from bug #489912)

Expected result:
The text object flowed into the rectangle is rendered at its original position (inside the rectangle)

Actual result:
The text object is displaced - likely because the rectangle has a preserved transformation (it was rotated by 90°).

Variant B:
1) launch current trunk
2) draw a rectangle
3) rotate the rectangle 90° clockwise
4) create a short text object
5) select all (Ctrl+A), flow text into frame (Alt+W)

Expected result:
The text is flowed into the rotated rectangle

Actual result:
The text flowed into the rectangle is displaced (renders outside the rectangle).

Reproduced with Inkscape 0.91+devel r13937 on OS X 10.7.5

Based on tests with stable and archived trunk builds:
- not reproduced with Inkscape 0.48.5 r10040, 0.91 r13725,
- not reproduced with Inkscape 0.91+devel rev <= 13699,
- reproduced with Inkscape 0.91+devel rev >= 13702;
it seems that the unexpected displacement of text-flowed-into-frame if the frame has a preserved transformation attribute is related to the changes in revision 13700:
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/changes/13702

Revision 13700: Removed SP_USE/SP_IS_USE Gtk-ish macros and cleaned affected files.
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/13700