OK, that was a bit hard to get working, but here we are.

test setup:
- OpenSolaris 2009.06 running as a virtual machine on top of a Windows box
- package (OK, it's old but I had nothing better at hand and it's still older (April 2009) than the OP's report in the present ticket)
- Downloaded constraints.tcl and textDisp.test from latest core-8-5-branch
- Ran wish8.5
- In wish, sourced a text file constituted by the concatenation of contraints.tcl and textDisp.test

Result: textDisp-27.7 DOES fail indeed.

The obtained result is however different from the OP's results:

---- Result was:
-9 18 7 13
---- Result should have been (exact matching):
-28 18 7 13
==== textDisp-27.7 FAILED