Dead keys doesn't work in a terminal window in gvim

I'm using gvim 8.1.1140 on Windows 7 with US-International layout
keyboard.

Normally, when I use the command prompt cmd.exe, with code page 1252,
and press the ' key (dead key) and the "a" key I get "á", but on a
terminal window in gvim I get 'a.
The same happens with the keys "^" and "a". I should get "â", but I get
^a.

On neovim I don't have that problem, and I can get accented characters
using dead keys on a terminal.

Many thanks in advance,

--
Cesar

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