bug#42099: Emacs -nw Turkish Layout Problem

[Eli Zaretskii]

> Cc: 42099@debbugs.gnu.org
> From: Yigit Emre Sahinoglu <yigitemres@gmail.com>
> Date: Sun, 28 Jun 2020 21:39:34 +0300
> 
> > If you start "emacs -Q -nw" in a cmd.exe window, then type ş, what
> > happens?
> "ş" turns into "_".
> 
> 
> > And what does "C-h l" report after that?
> _               ;; self-insert-command
> C-h k        ;; view-lossage
> 
> 
> > Also, what happens if you type "C-x 8 RET 15f RET", do you see the ş
> > character on display, or do you see something else?
> \u015F

So there are two problems: both keyboard input and display of Turkish
characters are broken.  Is this still on a system where
w32-get-console-codepage returns 437?

Does anything change regarding typing Turkish characters if you set
w32-use-fallback-wm-chars-method to a non-nil value?