vim-patch:8.1.0734: the hlsearch state is not stored in a session file (#13547)

Problem:    The hlsearch state is not stored in a session file.
Solution:   Add "nohlsearch" if appropriate. (Jason Franklin)
https://github.com/vim/vim/commit/e3c74d249ac36404d8af25f74baf335d143b30e3

Vi default for 'sessionoptions' includes 'options'.
Use 'set sessionoptions&vi' to use Vim's default 'sessionoptions'.
If a test sets 'sessionoptions',
reset 'sessionoptions' at the end of the test.

N/A patches for version.c:

vim-patch:8.2.0119: message test fails on some platforms

Problem:    Message test fails on some platforms. (Elimar Riesebieter)
Solution:   Add type cast to vim_snprintf() argument. (Dominique Pelle)
https://github.com/vim/vim/commit/1470dc35c4b14bda1995b7566c9a41a33eb06517

vim-patch:8.2.0234: message test fails on SunOS

Problem:    Message test fails on SunOS.
Solution:   Adjust expectation for printf "%p". (Ozaki Kiichi, closes vim/vim#5595)
https://github.com/vim/vim/commit/d5b991493816a2edba7cacdd06820cf3c0abc4dc

vim-patch:8.2.2149: popupwin test for latin1 sometimes fails

Problem:    Popupwin test for latin1 sometimes fails.
Solution:   Wait for the script to finish.
https://github.com/vim/vim/commit/4c5bdb99ad632d703e94fffafba11b91861fea48

vim-patch:8.2.2150: Github actions CI isn't used for all available platforms

Problem:    Github actions CI isn't used for all available platforms.
Solution:   Update the github workflows. (Ozaki Kiichi, closes vim/vim#7433)
https://github.com/vim/vim/commit/8ea05de6aa1d133cba3381bcc36adf1736b08e00

vim-patch:8.2.2151: $dir not expanded when configure checks for moonjit

Problem:    $dir not expanded when configure checks for moonjit.
Solution:   Use double quotes instead of single quotes. (closes vim/vim#7478)
https://github.com/vim/vim/commit/a79a8944dade9115ccaa5a06a076dfb257e56c62

vim-patch:8.2.2153: popupwin test for latin1 still fails sometimes

Problem:    Popupwin test for latin1 still fails sometimes.
Solution:   Wait for the "cat" command to finish.
https://github.com/vim/vim/commit/b125b535bb0456ab43c10683307a4bc359442d44

vim-patch:8.2.2154: popupwin test for terminal buffer fails sometimes

Problem:    Popupwin test for terminal buffer fails sometimes.
Solution:   Wait for the prompt to appear.
https://github.com/vim/vim/commit/0353f56ddb379e7f1a68172fa4743355e04df21e

src/nvim/ex_session.c

@@ -893,6 +893,9 @@ void ex_mkrc(exarg_T *eap)
                           && (*flagp & SSOP_OPTIONS))) {
       failed |= (makemap(fd, NULL) == FAIL
                  || makeset(fd, OPT_GLOBAL, false) == FAIL);
+      if (p_hls && fprintf(fd, "%s", "set hlsearch\n") < 0) {
+        failed = true;
+      }
     }
 
     if (!failed && view_session) {
@@ -949,11 +952,16 @@ void ex_mkrc(exarg_T *eap)
       }
       if (fprintf(fd,
                   "%s",
-                  "let &g:so = s:so_save | let &g:siso = s:siso_save\n"
-                  "doautoall SessionLoadPost\n")
+                  "let &g:so = s:so_save | let &g:siso = s:siso_save\n")
           < 0) {
         failed = true;
       }
+      if (no_hlsearch && fprintf(fd, "%s", "nohlsearch\n") < 0) {
+        failed = true;
+      }
+      if (fprintf(fd, "%s", "doautoall SessionLoadPost\n") < 0) {
+        failed = true;
+      }
       if (eap->cmdidx == CMD_mksession) {
         if (fprintf(fd, "unlet SessionLoad\n") < 0) {
           failed = true;

src/nvim/testdir/setup.vim

@@ -20,6 +20,7 @@ set tags=./tags,tags
 set undodir^=.
 set wildoptions=
 set startofline
+set sessionoptions&vi
 
 " Prevent Nvim log from writing to stderr.
 let $NVIM_LOG_FILE = exists($NVIM_LOG_FILE) ? $NVIM_LOG_FILE : 'Xnvim.log'

src/nvim/testdir/test_mksession.vim

@@ -128,6 +128,7 @@ func Test_mksession()
   call delete('Xtest_mks.out')
   call delete(tmpfile)
   let &wrap = wrap_save
+  set sessionoptions&
 endfunc
 
 func Test_mksession_winheight()
@@ -154,7 +155,7 @@ func Test_mksession_rtp()
     return
   endif
   new
-  set sessionoptions+=options
+  set sessionoptions&vi
   let _rtp=&rtp
   " Make a real long (invalid) runtimepath value,
   " that should exceed PATH_MAX (hopefully)
@@ -174,6 +175,7 @@ func Test_mksession_rtp()
   call assert_equal(expected, li)
 
   call delete('Xtest_mks.out')
+  set sessionoptions&
 endfunc
 
 " Verify that arglist is stored correctly to the session file.
@@ -218,6 +220,25 @@ func Test_mksession_one_buffer_two_windows()
   call delete('Xtest_mks.out')
 endfunc
 
+if has('extra_search')
+
+func Test_mksession_hlsearch()
+  set sessionoptions&vi
+  set hlsearch
+  mksession! Xtest_mks.out
+  nohlsearch
+  source Xtest_mks.out
+  call assert_equal(1, v:hlsearch, 'session should restore search highlighting state')
+  nohlsearch
+  mksession! Xtest_mks.out
+  source Xtest_mks.out
+  call assert_equal(0, v:hlsearch, 'session should restore search highlighting state')
+  set sessionoptions&
+  call delete('Xtest_mks.out')
+endfunc
+
+endif
+
 " Test :mkview with a file argument.
 func Test_mkview_file()
   " Create a view with line number and a fold.