patch 8.2.0848: MS-Windows: the Windows terminal code has some flaws

Problem:    MS-Windows: the Windows terminal code has some flaws.
Solution:   Do not redraw the right edge of the screen.  Remove the background
            color trick.  Flush the screen output buffer often.  (Nobuhiro
            Takasaki, #5546)
diff --git a/src/term.c b/src/term.c
index 5880589..d774ebc 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2956,7 +2956,16 @@
 
     vim_snprintf(buf, MAX_COLOR_STR_LEN,
 				  (char *)s, RED(rgb), GREEN(rgb), BLUE(rgb));
-    OUT_STR(buf);
+#ifdef FEAT_VTP
+    if (use_wt())
+    {
+	out_flush();
+	buf[1] = '[';
+	vtp_printf(buf);
+    }
+    else
+#endif
+	OUT_STR(buf);
 }
 
     void