Revert ad01c1b614

This change broke key names for dead keys, because that depends on
the effect on the global state of simulating two key presses.

Issue found by CTest tests.

Reverts #2018

README.md

@@ -205,8 +205,6 @@ information on what to include when reporting a bug.
  - [Win32] Bugfix: Content scale queries could fail silently (#1615)
  - [Win32] Bugfix: Content scales could have garbage values if monitor was recently
    disconnected (#1615)
- - [Win32] Bugfix: Key name update modified global key state on Windows 10 1607
-   and later (#2018)
  - [Win32] Bugfix: A window created maximized and undecorated would cover the whole
    monitor (#1806)
  - [Win32] Bugfix: The default restored window position was lost when creating a maximized

src/win32_init.c

@@ -460,11 +460,6 @@ void _glfwUpdateKeyNamesWin32(void)
 {
     int key;
     BYTE state[256] = {0};
-    UINT flags = 0;
-
-    // Avoid modifying the global key state if supported
-    if (_glfwIsWindows10Version1607OrGreaterWin32())
-        flags = (1 << 2);
 
     memset(_glfw.win32.keynames, 0, sizeof(_glfw.win32.keynames));
 
@@ -494,13 +489,13 @@ void _glfwUpdateKeyNamesWin32(void)
 
         length = ToUnicode(vk, scancode, state,
                            chars, sizeof(chars) / sizeof(WCHAR),
-                           flags);
+                           0);
 
         if (length == -1)
         {
             length = ToUnicode(vk, scancode, state,
                                chars, sizeof(chars) / sizeof(WCHAR),
-                               flags);
+                               0);
         }
 
         if (length < 1)