vim-patch:8.2.1833: when reading from stdin dup() is called twice (#13498)

Problem:    When reading from stdin dup() is called twice.
Solution:   Remove the dup() in main.c. (Ken Takata, closes vim/vim#7110)
204ade6bcb

N/A patches for version.c:

vim-patch:8.2.2109: "vim -" does not work well when modifyOtherKeys is enabled

Problem:    "vim -" does not work well when modifyOtherKeys is enabled and a
            shell command is executed on startup.
Solution:   Only change modifyOtherKeys when executing a shell command in raw
            mode.
8a3da6a368

vim-patch:8.2.2110: cannot use ":shell" when reading from stdin

Problem:    Cannot use ":shell" when reading from stdin. (Gary Johnson)
Solution:   Revert patch 8.2.1833.
8e1cbb55c3

vim-patch:8.2.2111: GTK: menu background is the same color as the main window

Problem:    GTK: Menu background is the same color as the main window.
Solution:   Fix white space around the test in another way. (closes vim/vim#7437,
            closes vim/vim#7427)
023fd5d213

vim-patch:8.2.2113: MS-Windows GUI: crash after using ":set guifont=" four times

Problem:    MS-Windows GUI: crash after using ":set guifont=" four times.
Solution:   Check for NULL pointer. (Ken Takata, closes vim/vim#7434)
1b3e0727ce

vim-patch:8.2.2116: MS-Windows GUI: test for 'guifont' is incomplete

Problem:    MS-Windows GUI: test for 'guifont' is incomplete.
Solution:   Set 'renderoptions'. (Christian Brabandt)
2c78a772fd

vim-patch:8.2.2118: dead code in the job support

Problem:    Dead code in the job support. (Dominique Pellé)
Solution:   Define USE_ARGV before checking for it.
f46bf5204c

vim-patch:8.2.2119: GTK3: status line background color is wrong

Problem:    GTK3: status line background color is wrong.
Solution:   Don't change the code for earlier GTK3 versions. (closes vim/vim#7444)
7988a6f0e9

src/nvim/main.c

@@ -1414,7 +1414,10 @@ static void read_stdin(void)
   no_wait_return = true;
   int save_msg_didany = msg_didany;
   set_buflisted(true);
-  (void)open_buffer(true, NULL, 0);  // create memfile and read file
+
+  // Create memfile and read from stdin.
+  (void)open_buffer(true, NULL, 0);
+
   if (BUFEMPTY() && curbuf->b_next != NULL) {
     // stdin was empty, go to buffer 2 (e.g. "echo file1 | xargs nvim"). #8561
     do_cmdline_cmd("silent! bnext");