Keys Ctrl-[ and Ctrl-] are gobbled and not sent to the application although they are not configured as shortcuts in Setting/Keyboard/Application Shortcuts.
These keys are used in the <oXygen/> XML editor for jumping to the beginning/end of a tag. This is an extremely useful feature and without it XML editing is more difficult and prone to make errors.
You can get free trial version at http://www.oxygenxml.com/
Versions that may be important:
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