BUG: Fix crash if Alt+Tab is pressed when transforms module is active.

$ git shortlog 90000c32..f64b68acd
Andras Lasso (1):
      Prevent reentrant calling of ctkProxyStyle::ensureBaseStyle()

Jean-Christophe Fillion-Robin (1):
      Merge pull request #372 from lassoan/371-ensure-base-style-infinite-recursion-crash

Fixes #3129

From: Andras Lasso <lasso@cs.queensu.ca>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22541 3bd1e089-480b-0410-8dfb-8563597acbee