From 4dc0e54d4fffa2b81fbf6fb9b875303638eb1c9a Mon Sep 17 00:00:00 2001
From: wm4 <wm4@mplayer2.org>
Date: Fri, 13 Apr 2012 17:25:30 +0200
Subject: [PATCH] win32: prevent modifier keys from getting stuck

Especially Alt would get stuck when using Alt+Tab to change focus.
Apparently Windows doesn't send an appropriate key up message. Solve
this by resetting the modifier state on focus change.
---
 libvo/w32_common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libvo/w32_common.c b/libvo/w32_common.c
index ff9e2dd505..513cf2820c 100644
--- a/libvo/w32_common.c
+++ b/libvo/w32_common.c
@@ -239,6 +239,11 @@ static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM l
             }
             break;
         }
+        case WM_SETFOCUS:
+        case WM_KILLFOCUS:
+            // prevent modifier keys from getting stuck
+            memset(key_state, 0, sizeof(key_state));
+            break;
         case WM_LBUTTONDOWN:
             if (!vo_nomouse_input && (vo_fs || (wParam & MK_CONTROL))) {
                 mplayer_put_key(MOUSE_BTN0 | mod_state());