vim-patch:8.2.3393: escaping for fish shell is skipping some characters

Problem:    Escaping for fish shell is skipping some characters.
Solution:   Escape character after backslash if needed. (Jason Cox,
            closes vim/vim#8827)
6631597452

src/nvim/strings.c

@@ -278,6 +278,7 @@ char_u *vim_strsave_shellescape(const char_u *string,
     if (*p == '\\' && fish_like) {
       *d++ = '\\';
       *d++ = *p++;
+      continue;
     }
 
     MB_COPY_CHAR(p, d);