[Bug 32073] Some chars are mapped as dead key

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=32073

--- Comment #3 from Evan <cerebro.alexiel at gmail.com> ---
Created attachment 68379
  --> https://bugs.winehq.org/attachment.cgi?id=68379
VkKeyScanA(0xe7) testcase source

I gave this bug another try today with the latest wine.

I wrote a simple test program to better understand the issue.
It calls GetKeyboardLayout to display what is the current keyboard layout then
calls VkKeyScanA(0xe7) to show it returns different values depending on locale
used.

$ locale -a
<some locales are omitted here on purpose>
en_US.utf8
fr_FR.utf8
fr_FR.ISO-8859-1

$ LANG=en_US.UTF-8 ./testbug64.exe
GetKeyboardLayout(0) => 0x409
VkKeyScanA(0xe7) => -1

$ LANG=fr_FR.UTF-8 ./testbug64.exe
GetKeyboardLayout(0) => 0x40c
VkKeyScanA(0xe7) => -1

$ LANG=fr_FR.ISO-8859-1 ./testbug64.exe
GetKeyboardLayout(0) => 0x40c
VkKeyScanA(0xe7) => 57

57 is 0x39 which is the '9' key.
On my French keyboard, this key has the following characters: 'ç'/'9'/'^'.

On my Windows 10 box, display language is "English (United Kingdom)" and
keyboard layout is "French"
C:\Users\me> C:\Users\me\Desktop\testbug64.exe 
GetKeyboardLayout(0) => 0x809
VkKeyScanA(0xe7) => 57

For reference
- 0x0409: en-US
- 0x040C: fr-FR
- 0x0809: en-GB

I understand we are asking wine what key is associated with the 'ç' character.
Depending on the keyboard layout used, it may works or not which is normal.
The issue is that changing the locale changes the keyboard layout (it seems
wrong to me).

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