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For has not opened -- Source editor and Form Editor are closed. Guarded fields (components) or methods (handlers) can be cuted and pasted into another class. If Form is opened it works without problems -- fields are not deleted and Error message about guarded block is showed.
*** This bug has been marked as a duplicate of 7523 ***
verified
Resolved for 3.4.x or earlier, no new info since then -> closing.