# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1443187804 -7200
# Node ID aaf96b1aa605f746aad18a1c630cbb1af92f349d
# Parent  7a0c929227e54f4d246a22b6e74d5250499ed53c
commit https://github.com/vim/vim/commit/b0262f239e77480f81fa3345491b7b6d52a17f6d
Author: Bram Moolenaar <Bram@vim.org>
Date:   Fri Sep 25 15:28:38 2015 +0200

    patch 7.4.876
    Problem:    Windows7: when using vim.exe with msys or msys2, conhost.exe
                (console window provider on Windows7) will freeze or crash.
    Solution:   Make original screen buffer active, before executing external
                program.  And when the program is finished, revert to vim's one.
                (Taro Muraoka)

diff --git a/src/os_win32.c b/src/os_win32.c
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -234,6 +234,7 @@ static int suppress_winsize = 1;	/* don'
 
 static char_u *exe_path = NULL;
 
+static BOOL is_win7 = FALSE;
 static BOOL win8_or_later = FALSE;
 
 /*
@@ -680,6 +681,9 @@ PlatformId(void)
 
 	g_PlatformId = ovi.dwPlatformId;
 
+	if ((ovi.dwMajorVersion == 6 && ovi.dwMinorVersion == 1))
+	    is_win7 = TRUE;
+
 	if ((ovi.dwMajorVersion == 6 && ovi.dwMinorVersion >= 2)
 		|| ovi.dwMajorVersion > 6)
 	    win8_or_later = TRUE;
@@ -4581,11 +4585,12 @@ mch_system(char *cmd, int options)
     else
 	return mch_system_classic(cmd, options);
 }
+
 #else
 
 # ifdef FEAT_MBYTE
     static int
-mch_system(char *cmd, int options)
+mch_system1(char *cmd, int options)
 {
     if (enc_codepage >= 0 && (int)GetACP() != enc_codepage)
     {
@@ -4600,9 +4605,31 @@ mch_system(char *cmd, int options)
     return system(cmd);
 }
 # else
-#  define mch_system(c, o) system(c)
+#  define mch_system1(c, o) system(c)
 # endif
 
+    static int
+mch_system(char *cmd, int options)
+{
+    int ret;
+
+    /*
+     * Restore non-termcap screen buffer before execute external program, and
+     * revert it after.  Because msys and msys2's programs will cause freeze
+     * or crash conhost.exe (Windows's console window provider) and vim.exe,
+     * if active screen buffer is vim's one on Windows7.
+     */
+    if (is_win7 && g_fTermcapMode)
+	SetConsoleActiveScreenBuffer(g_cbNonTermcap.handle);
+
+    ret = mch_system1(cmd, options);
+
+    if (is_win7 && g_fTermcapMode)
+	SetConsoleActiveScreenBuffer(g_cbTermcap.handle);
+
+    return ret;
+}
+
 #endif
 
 /*
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    876,
+/**/
     875,
 /**/
     874,