From 0cb92317201a79b1c34c76d4133b23c6fa4842ad Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@users.noreply.github.com>
Date: Sun, 17 Feb 2019 22:20:50 -0800
Subject: [PATCH] Avoid shifting negative value

---
 src/common/strconv.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index 88f22fe95d..560322317a 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -1425,7 +1425,7 @@ size_t wxMBConvUTF8::FromWChar(char *buf, size_t n,
                 len += cnt + 1;
                 if (buf)
                 {
-                    *buf++ = (char) ((-128 >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt)));
+                    *buf++ = (char) ((~0x7fu >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt)));
                     while (cnt--)
                         *buf++ = (char) (0x80 | ((cc >> (cnt * 6)) & 0x3f));
                 }