How do I enable undo in eclipse ant editor?

Undo is not working for me in ant editor in eclipse. When I press Ctrl-Z nothing happens.

Is it possible to enable undo somehow or is this a bug?

I am using Eclipse 3.4.2 (Ganymede) on Windows XP Professional.

Solution

Yes undo should be working perfectly in an ant editor.
For Ctrl-Z to not workcould mean:

the shortcut has been assigned to another action (Windows > Preferences > General > Keys)
the undo buffer size is somehow at '0' (Windows > Preferences > General > Editors > Text Editor)
a plugin somehow 'steals' the key event for itself

Try a fresh install, and check also with a latest Galileo (3.5RC2) install to see if the problem persist.

Note: zvikico mentions the existence of a known bug with ant editor in 3.4.2

After a quick search, the following bugs might explain your situation:

267780 [ant editor] delete line cannot be undone after cursor has been moved
247434 Failed to undo removal of line in Ant editor, only with 'Eclipse IDE for Java Developers', with Eclipse Classic you don't get this behavior

and finally:

239115 Undo functionality does not work anymore in the ant editor, mainly because a WTP issue, only solved in 3.5