patch 9.0.1852: i_CTRL-O does not reset Select Mode

Problem:  i_CTRL-O does not reset Select Mode
Solution: Reset select mode on CTRL-O in insert mode

closes: #13001
closes: #12115

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Christian Brabandt <cb@256bit.org>

src/edit.c

@@ -3859,6 +3859,7 @@ ins_insert(int replaceState)
     static void
 ins_ctrl_o(void)
 {
+    restart_VIsual_select = 0;
     if (State & VREPLACE_FLAG)
 	restart_edit = 'V';
     else if (State & REPLACE_FLAG)

src/testdir/test_selectmode.vim

@@ -310,4 +310,15 @@ func Test_selectmode_register()
   bw!
 endfunc
 
+func Test_ins_ctrl_o_in_insert_mode_resets_selectmode()
+  new
+  " ctrl-o in insert mode resets restart_VIsual_select
+  call setline(1, 'abcdef')
+  call cursor(1, 1)
+  exe "norm! \<c-v>\<c-g>\<c-o>c\<c-o>\<c-v>\<right>\<right>IABC"
+  call assert_equal('ABCbcdef', getline(1))
+
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1852,
 /**/
     1851,
 /**/