patch 8.2.4996: setbufline() may change Visual selection

Problem:    setbufline() may change Visual selection. (Qiming Zhao)
Solution:   Disable Visual mode when using another buffer. (closes #10466)
diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index 1b82984..13f813e 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -144,6 +144,7 @@
     buf_T	*curbuf_save = NULL;
     win_T	*curwin_save = NULL;
     int		is_curbuf = buf == curbuf;
+    int		save_VIsual_active = VIsual_active;
 
     // When using the current buffer ml_mfp will be set if needed.  Useful when
     // setline() is used on startup.  For other buffers the buffer must be
@@ -158,6 +159,7 @@
 
     if (!is_curbuf)
     {
+	VIsual_active = FALSE;
 	curbuf_save = curbuf;
 	curwin_save = curwin;
 	curbuf = buf;
@@ -264,6 +266,7 @@
     {
 	curbuf = curbuf_save;
 	curwin = curwin_save;
+	VIsual_active = save_VIsual_active;
     }
 }