Detect when the pop-up menu is dismissed with CTRL-E

Hi,
I need to distinguish in my plugin the situation in which the user
dismisses the pop-up menu with CTRL-E (:help complete_CTRL-E) from the
situation in which the menu is closed because the user presses some
other key.

Is there a way that does not require mapping <C-E> in Insert mode?

Thanks in advance,
Life.

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