Fix bug #1280 with non-ASCII keyboard input on MS-Windows.

 src/w32fns.c (w32_wnd_proc): Don't directly handle key chords
 including modifiers from toggle key, such as Scroll Lock, if the
 respective keys are treated as function keys, not as modifiers.
 This avoids destroying non-ASCII keyboard input when Scroll Lock
 is toggled ON.

diff --git a/src/ChangeLog b/src/ChangeLog
index e5c6dd6..77faa94 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,11 @@
+2012-11-07  Eli Zaretskii  <eliz@gnu.org>
+
+       * w32fns.c (w32_wnd_proc): Don't directly handle key chords
+       including modifiers from toggle key, such as Scroll Lock, if the
+       respective keys are treated as function keys, not as modifiers.
+       This avoids destroying non-ASCII keyboard input when Scroll Lock
+       is toggled ON.  (Bug#1280)
+
 2012-11-07  Dmitry Antipov  <dmantipov@yandex.ru>
 
        * xfns.c (Fx_wm_set_size_hint): Use check_x_frame.  Adjust docstring.

diff --git a/src/w32fns.c b/src/w32fns.c
index 2476005..e9e1950 100644 (file)
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -2974,12 +2974,21 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
            {
              DWORD modifiers = construct_console_modifiers ();
 
-             if (!NILP (Vw32_recognize_altgr)
-                 && modifier_set (VK_LCONTROL) && modifier_set (VK_RMENU))
+             /* Always let TranslateMessage handle AltGr key chords;
+                for some reason, ToAscii doesn't always process AltGr
+                chords correctly.  */
+             if ((!NILP (Vw32_recognize_altgr)
+                  && modifier_set (VK_LCONTROL) && modifier_set (VK_RMENU))
+                 /* If a toggle key is used as a function key, let
+                    TranslateMessage handle keys pressed while the
+                    toggled key is ON.  This avoids munging non-ASCII
+                    keys, like interpreting them as ASCII keys below,
+                    when, e.g., Scroll Lock is toggled ON.  */
+                 || (NILP (Vw32_scroll_lock_modifier)
+                     && modifier_set (VK_SCROLL))
+                 || (NILP (Vw32_enable_num_lock) && modifier_set (VK_NUMLOCK))
+                 || (NILP (Vw32_enable_caps_lock) && modifier_set (VK_CAPITAL)))
                {
-                 /* Always let TranslateMessage handle AltGr key chords;
-                    for some reason, ToAscii doesn't always process AltGr
-                    chords correctly.  */
                  windows_translate = 1;
                }
              else if ((modifiers & (~SHIFT_PRESSED & ~CAPSLOCK_ON)) != 0)