- Cleaned up dialog creation a little (some details, such as font, were being changed after the dialog was already visible).
- Restores focus to its previous state when exiting.
- Fixed another one of those "holding down Cancel at the wrong moment can cause the installer to suddenly exit" problems.
git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3443 212acab6-be3b-0410-9dea-997c60f758d6