patch 8.1.0734: the hlsearch state is not stored in a session file

Problem:    The hlsearch state is not stored in a session file.
Solution:   Add "nohlsearch" if appropriate. (Jason Franklin)

src/ex_docmd.c

@@ -10144,6 +10144,10 @@ ex_mkrc(
 	    if (put_line(fd, "let &so = s:so_save | let &siso = s:siso_save")
 								      == FAIL)
 		failed = TRUE;
+# ifdef FEAT_SEARCH_EXTRA
+	    if (no_hlsearch && put_line(fd, "nohlsearch") == FAIL)
+		failed = TRUE;
+# endif
 	    if (put_line(fd, "doautoall SessionLoadPost") == FAIL)
 		failed = TRUE;
 	    if (eap->cmdidx == CMD_mksession)

src/testdir/test_mksession.vim

@@ -198,6 +198,24 @@ func Test_mksession_blank_tabs()
   call delete('Xtest_mks.out')
 endfunc
 
+if has('extra_search')
+
+func Test_mksession_hlsearch()
+  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')
+  call delete('Xtest_mks.out')
+endfunc
+
+endif
+
+
 func Test_mksession_blank_windows()
   split
   split

src/version.c

@@ -795,6 +795,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    734,
 /**/
     733,
 /**/