caused by VclPtr fixes which meant instead of the dialog staying in an
always-zero ref-count state, it went up to a ref-count of 1, then down
to zero, which triggered a delete before the dialog had finished
displaying.

And revert my fix in commit 0c1cd678
which just worked around the underlying problem

Change-Id: Icb35535dd06a2d1db1016d00d106760847d87430