patch 8.2.3444: concealed text not revealed when leaving insert mode

Problem:    concealed text not revealed when leaving insert mode. (Michael
            Soyka)
Solution:   Check if concealing changed when leaving insert mode.
            (closes #8880)
diff --git a/src/testdir/test_conceal.vim b/src/testdir/test_conceal.vim
index b555682..3a24b7f 100644
--- a/src/testdir/test_conceal.vim
+++ b/src/testdir/test_conceal.vim
@@ -59,9 +59,11 @@
   " Check that with cursor line is only concealed in Insert mode
   call term_sendkeys(buf, ":set concealcursor=i\r")
   call VerifyScreenDump(buf, 'Test_conceal_two_windows_07n', {})
-  call term_sendkeys(buf, "a")
+  call term_sendkeys(buf, "14|a")
   call VerifyScreenDump(buf, 'Test_conceal_two_windows_07i', {})
-  call term_sendkeys(buf, "\<Esc>/e")
+  call term_sendkeys(buf, "\<Esc>")
+  call VerifyScreenDump(buf, 'Test_conceal_two_windows_07in', {})
+  call term_sendkeys(buf, "/e")
   call VerifyScreenDump(buf, 'Test_conceal_two_windows_07c', {})
   call term_sendkeys(buf, "\<Esc>v")
   call VerifyScreenDump(buf, 'Test_conceal_two_windows_07v', {})