Fix occasional widget disposed exception

git-svn-id: http://dev.eclipse.org/svnroot/technology/org.eclipse.stem/branches/STEM_1_4_0@3453 92a21009-5b66-0410-b83a-dc787c41c6e9
1 file changed
tree: cfb98abedc25d0b9cb90908f2fbfc4aa5a0c4450
  1. analysis/
  2. core/
  3. developer_tools/
  4. distributed/
  5. docs/
  6. features/
  7. models/
  8. releng/
  9. tests/