I am currently working with Eclipse Version: 2020-06 (4.16.0) on a Mac. When I go to Eclipse > Preferences > General > Keys the Undo and Redo shortcut bindings are set to Command Z and Command Shift Z, respectively. However, when I try to undo / redo code that I am writing in PyDev perspective, the shortcuts do not work. Even the Undo/Redo in the Edit field are greyed out and cannot be manually done. Any idea why this is happening and how it can be fixed? Thank you.
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This question seems to be duplicated or, at least, here you can find a similar issue.

frblazquez
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I have checked that thread and similar threads and it has not helped my problem. – Transcending Mar 31 '21 at 20:09
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Have you also checked [this](https://stackoverflow.com/questions/913059/how-do-i-enable-undo-in-eclipse-ant-editor)? It explains some possible sources for this error. – frblazquez Mar 31 '21 at 20:15