updated for version 7.3.852

Problem:    system() breaks clipboard text. (Yukihiro Nakadaira)
Solution:   Use Xutf8TextPropertyToTextList(). (Christian Brabandt)
            Also do not put the text in the clip buffer if conversion fails.

src/ops.c

@@ -5828,6 +5828,8 @@ x11_export_final_selection()
 					       && len < 1024*1024 && len > 0)
     {
 #ifdef FEAT_MBYTE
+	int ok = TRUE;
+
 	/* The CUT_BUFFER0 is supposed to always contain latin1.  Convert from
 	 * 'enc' when it is a multi-byte encoding.  When 'enc' is an 8-bit
 	 * encoding conversion usually doesn't work, so keep the text as-is.
@@ -5842,6 +5844,7 @@ x11_export_final_selection()
 		int	intlen = len;
 		char_u	*conv_str;
 
+		vc.vc_fail = TRUE;
 		conv_str = string_convert(&vc, str, &intlen);
 		len = intlen;
 		if (conv_str != NULL)
@@ -5849,12 +5852,26 @@ x11_export_final_selection()
 		    vim_free(str);
 		    str = conv_str;
 		}
+		else
+		{
+		    ok = FALSE;
+		}
 		convert_setup(&vc, NULL, NULL);
 	    }
+	    else
+	    {
+		ok = FALSE;
+	    }
 	}
+
+	/* Do not store the string if conversion failed.  Better to use any
+	 * other selection than garbled text. */
+	if (ok)
 #endif
-	XStoreBuffer(dpy, (char *)str, (int)len, 0);
+	{
-	XFlush(dpy);
+	    XStoreBuffer(dpy, (char *)str, (int)len, 0);
+	    XFlush(dpy);
+	}
     }
 
     vim_free(str);

src/ui.c

@@ -2119,7 +2119,13 @@ clip_x11_request_selection_cb(w, success, sel_atom, type, value, length,
 	text_prop.encoding = *type;
 	text_prop.format = *format;
 	text_prop.nitems = len;
-	status = XmbTextPropertyToTextList(X_DISPLAY, &text_prop,
+#ifdef FEAT_MBYTE
+	if (*type == utf8_atom)
+	    status = Xutf8TextPropertyToTextList(X_DISPLAY, &text_prop,
+							 &text_list, &n_text);
+	else
+#endif
+	    status = XmbTextPropertyToTextList(X_DISPLAY, &text_prop,
 							 &text_list, &n_text);
 	if (status != Success || n_text < 1)
 	{

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    852,
 /**/
     851,
 /**/