winex11: Fix Ctrl+Tab translation.

dlls/user32/tests/input.c

@@ -1276,7 +1276,7 @@ static void test_ToUnicode(void)
     state[VK_LCONTROL] |= HIGHEST_BIT;
 
     ret = ToUnicode(VK_TAB, SC_TAB, state, wStr, 2, 0);
-    todo_wine ok(ret == 0, "ToUnicode for CTRL + Tab didn't return 0 (was %i)\n", ret);
+    ok(ret == 0, "ToUnicode for CTRL + Tab didn't return 0 (was %i)\n", ret);
 
     ret = ToUnicode(VK_RETURN, SC_RETURN, state, wStr, 2, 0);
     ok(ret == 1, "ToUnicode for CTRL + Return didn't return 1 (was %i)\n", ret);

dlls/winex11.drv/keyboard.c

@@ -2679,7 +2679,8 @@ INT CDECL X11DRV_ToUnicodeEx(UINT virtKey, UINT scanCode, const BYTE *lpKeyState
         if (e.state & ControlMask)
         {
             if (((keysym>=33) && (keysym < 'A')) ||
-                ((keysym > 'Z') && (keysym < 'a')))
+                ((keysym > 'Z') && (keysym < 'a')) ||
+                (keysym == XK_Tab))
             {
                 lpChar[0] = 0;
                 ret = 0;