--- ./before-diff/sdl.c	2004-05-18 10:33:05.000000000 +0700
+++ ./sdl.c	2004-05-18 10:40:55.000000000 +0700
@@ -130,6 +130,7 @@
 static void sdl_process_key(SDL_KeyboardEvent *ev)
 {
     int keycode, v;
+    static int modif;
     
     /* XXX: not portable, but avoids complicated mappings */
     keycode = ev->keysym.scancode;
@@ -150,6 +151,78 @@
     } else {
         keycode = 0;
     }
+    /* Adjust shift-key states when leaving window */
+
+    if (ev->keysym.scancode == 0) {
+        if ((modif ^ ev->keysym.mod) & KMOD_LSHIFT)
+            kbd_put_keycode(0x2a | (modif & KMOD_LSHIFT ? 0x80 : 0));
+        if ((modif ^ ev->keysym.mod) & KMOD_RSHIFT)
+            kbd_put_keycode(0x36 | (modif & KMOD_RSHIFT ? 0x80 : 0));
+        if ((modif ^ ev->keysym.mod) & KMOD_LCTRL)
+            kbd_put_keycode(0x1d | (modif & KMOD_LCTRL ? 0x80 : 0));
+        if ((modif ^ ev->keysym.mod) & KMOD_RCTRL) {
+            kbd_put_keycode(0xe0 );
+            kbd_put_keycode(0x1d | (modif & KMOD_RCTRL ? 0x80 : 0));
+        }
+        if ((modif ^ ev->keysym.mod) & KMOD_LALT)
+            kbd_put_keycode(0x38 | (modif & KMOD_LALT ? 0x80 : 0));
+        if ((modif ^ ev->keysym.mod) & KMOD_RALT) {
+            kbd_put_keycode(0xe0 );
+            kbd_put_keycode(0x38 | (modif & KMOD_RALT ? 0x80 : 0));
+        }
+        modif = ev->keysym.mod;
+    }
+
+    /* remember shift-key state */
+
+    switch (keycode) {
+    case 0x2a:                          /* Left Shift */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_LSHIFT;
+        else
+            modif |= KMOD_LSHIFT;
+        break;
+    case 0x36:                          /* Right Shift */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_RSHIFT;
+        else
+            modif |= KMOD_RSHIFT;
+        break;
+    case 0x1d:                          /* Left CTRL */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_LCTRL;
+        else
+            modif |= KMOD_LCTRL;
+        break;
+    case 0x1de0:                        /* Right CTRL */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_RCTRL;
+        else
+            modif |= KMOD_RCTRL;
+        break;
+    case 0x38:                          /* Left ALT */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_LALT;
+        else
+            modif |= KMOD_LALT;
+        break;
+    case 0x38e0:                        /* Right ALT */
+        if (ev->type == SDL_KEYUP)
+            modif &= ~KMOD_RALT;
+        else
+            modif |= KMOD_RALT;
+        break;
+    case 0x45:                          /* Num Lock */
+        kbd_put_keycode(0x45);
+        kbd_put_keycode(0xc5);
+        return;
+    case 0x3a:                          /* Caps Lock */
+        kbd_put_keycode(0x3a);
+        kbd_put_keycode(0xba);
+        return;
+
+    }
+
     
     /* now send the key code */
     while (keycode != 0) {