Stop VS from keeping the US layout loaded and only intercept Alt+`

VistaSwitcherFixer.c

#include "avrf.h"

typedef HKL(WINAPI *P_LOADKEYBOARDLAYOUTW)(LPCWSTR, UINT);
HKL WINAPI LoadKeyboardLayoutWHook(LPCWSTR, UINT);

//typedef BOOL(WINAPI *P_REGISTERHOTKEY)(HWND, INT, UINT, UINT);
BOOL WINAPI RegisterHotKeyHook(HWND, INT, UINT, UINT);

typedef UINT(WINAPI *P_MAPVIRTUALKEYEXW)(UINT, UINT, HKL);
UINT WINAPI MapVirtualKeyExWHook(UINT, UINT, HKL);

static RTL_VERIFIER_THUNK_DESCRIPTOR aThunks[] = { { "LoadKeyboardLayoutW", NULL, (PVOID)(ULONG_PTR)LoadKeyboardLayoutWHook }, { "RegisterHotKey", NULL, (PVOID)(ULONG_PTR)RegisterHotKeyHook }, { "MapVirtualKeyExW", NULL, (PVOID)(ULONG_PTR)MapVirtualKeyExWHook }, { NULL, NULL, NULL } };
static RTL_VERIFIER_DLL_DESCRIPTOR aDlls[] = { { L"user32.dll", 0, NULL, aThunks }, { NULL, 0, NULL, NULL } };
static RTL_VERIFIER_PROVIDER_DESCRIPTOR avrfDescriptor = { sizeof(RTL_VERIFIER_PROVIDER_DESCRIPTOR), aDlls };

HKL WINAPI LoadKeyboardLayoutWHook(LPCWSTR pwszKLID, UINT Flags)
{
	return ((P_LOADKEYBOARDLAYOUTW)(ULONG_PTR)(aThunks[0].ThunkOldAddress))(pwszKLID, Flags | KLF_NOTELLSHELL | KLF_SETFORPROCESS);
	//return GetKeyboardLayout(0);
}

BOOL
WINAPI
RegisterHotKeyHook(
	HWND hWnd,
	INT id,
	UINT fsModifiers,
	UINT vk)
{
	return TRUE; // ((P_REGISTERHOTKEY)(ULONG_PTR)(aThunks[1].ThunkOldAddress))(hWnd, id, fsModifiers, vk);
}

UINT
WINAPI
MapVirtualKeyExWHook(
	UINT uCode,
	UINT uMapType,
	HKL dwhkl)
{
	if (uCode != VK_OEM_3)
		return 0;

	UINT ret = ((P_MAPVIRTUALKEYEXW)(ULONG_PTR)(aThunks[2].ThunkOldAddress))(uCode, uMapType, dwhkl);
	UnloadKeyboardLayout(dwhkl);
	return ret;
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, PRTL_VERIFIER_PROVIDER_DESCRIPTOR *pAvrfDescriptor)
{
	switch (fdwReason)
	{
	case DLL_PROCESS_ATTACH:
		__security_init_cookie();
		DisableThreadLibraryCalls(hinstDLL);
		break;
	case DLL_PROCESS_DETACH:
		break;
	case DLL_PROCESS_VERIFIER:
		*pAvrfDescriptor = &avrfDescriptor;
		break;
	default:
		break;
	}

	return TRUE;
}