patch 9.0.1634: message is cleared when removing mode message

Problem:    Message is cleared when removing mode message (Gary Johnson).
Solution:   Do not clear the command line after displaying a message.
diff --git a/src/testdir/dumps/Test_message_not_cleared_after_mode_1.dump b/src/testdir/dumps/Test_message_not_cleared_after_mode_1.dump
new file mode 100644
index 0000000..9e8d20a
--- /dev/null
+++ b/src/testdir/dumps/Test_message_not_cleared_after_mode_1.dump
@@ -0,0 +1,10 @@
+>o+0&#ffffff0|n|e| @71
+|t|w|o| @71
+|t|h|r|e@1| @69
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|f+0#0000000&|r|o|m| |D|e|b|u|g|S|i|l|e|n|t| |n|o|r|m|a|l| @33|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_message_not_cleared_after_mode_2.dump b/src/testdir/dumps/Test_message_not_cleared_after_mode_2.dump
new file mode 100644
index 0000000..49dabef
--- /dev/null
+++ b/src/testdir/dumps/Test_message_not_cleared_after_mode_2.dump
@@ -0,0 +1,10 @@
+>o+0&#ffffff0|n|e| @71
+|t|w|o| @71
+|t|h|r|e@1| @69
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|f+0#0000000&|r|o|m| |D|e|b|u|g|S|i|l|e|n|t| |v|i|s|u|a|l| @33|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
index ff705fe..0647afd 100644
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -336,6 +336,34 @@
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_message_not_cleared_after_mode()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      nmap <silent> gx :call DebugSilent('normal')<CR>
+      vmap <silent> gx :call DebugSilent('visual')<CR>
+      function DebugSilent(arg)
+          echomsg "from DebugSilent" a:arg
+      endfunction
+      set showmode
+      set cmdheight=1
+      call setline(1, ['one', 'two', 'three'])
+  END
+  call writefile(lines, 'XmessageMode', 'D')
+  let buf = RunVimInTerminal('-S XmessageMode', {'rows': 10})
+
+  call term_sendkeys(buf, 'gx')
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_message_not_cleared_after_mode_1', {})
+
+  " removing the mode message used to also clear the intended message
+  call term_sendkeys(buf, 'vEgx')
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_message_not_cleared_after_mode_2', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 " Test verbose message before echo command
 func Test_echo_verbose_system()
   CheckRunVimInTerminal