How to prevent the cursor from moving back one character on leaving Insert mode in Vim?

Although I would not recommend changing the default cursor mechanics,
one way of achieving the behavior in question is to use the following
Insert-mode mapping.

:inoremap <silent> <Esc> <Esc>`^

Here the Esc key is overloaded in Insert mode to additionally
run the `^ command which moves the cursor to the position where it
had been the last time Insert mode was left. Since in this mapping it
is executed immediately after leaving Insert mode with Esc,
the cursor is left one character to the right as compared to its
position with default behavior.

Unlike some other workarounds, this one does not require Vim to be
compiled with the +ex_extra feature.

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