Log Message:
Update to 1.2.12.

Release 1.2.12 - March 20, 2011
This is a bugfix release.

Bugs fixed:
- Bring back the 'Stop tracking effort' menu item in the context menu of task
  and effort viewers and make menu's more consistent. (SF#3206702)
- Added keyboard shortcuts for adding categories and notes.
- The Delete key wasn't working in text controls. (SF#3206464, SF#3213964)
- The Enter key wasn't working in text controls on Mac OS X. (SF#3223714)
- The Enter key would stop working after opening and closing a new viewer.
  (SF#3206366)
- Make Ctrl-Z (undo), Ctrl-Y (redo), Enter (edit) and Delete work in edit
  dialogs.
- Fixed a performance issue with the calendar viewer when tracking efforts.
- Don't clear the clipboard after pasting an item, so that an item can be
  pasted multiple times. (SF#3198880 )
- Don't try to add deleted prerequisite tasks when loading the task file.
  (SF#3219001)

Feature added:
- Provide more options for filtering completed, due and inactive tasks.
  (http://uservoice.com/a/eBFSz)