How do I enable undo in eclipse ant editor?

Question

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.

Answer 1

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.

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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

Answer 2

If the CTRL-Z (undo) does not work anymore, you might try that. It worked for me: go to Preferences -> General -> Keys and click on apply button or restore defaults button

Answer 3

I see this post is very old, but I am adding a response for the people who find this through the search engines.

Ctrl-Z stopped working in eclipse for me when I made a small change in one part of my code which in turn triggered an unexpected infinite loop in a different part of my code.

• I used the windows task manager to kill the application that I had been testing when Ctrl-Z had stopped working, and then I used system.out.println() to identify the part of the code where the infinite loop was being triggered.
• I then disabled that section of code, which in turn caused Ctrl-Z and everything else to start working again.
• I was able to finish debugging from there.