[Bug 58914] Basic Windows Combobox are randomly missing entries

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58914

--- Comment #5 from Bart Kindt  ---
Right.
I found a Linux laptop back to test with. The previous data came from a user.
Running Ubuntu 22.04, and the latest Wine from your website.
Installed SARTrack.
And I see exactly the same issues here.

Wrote a small test program, copied the relevant code over from the main
program.
Checked the Font and other settings, all the same.
Guess what: Of course it works fine in the test program.

So I played with the SARTrack source code: In the entries 'Add "IMT" then Add
"EOC" the "EOC" is missing. So I duplicated these two entries. And the second
time both showed normally (under the missing first "EOC").

So I wanted to see what actually ended up in the Combobox by reading it back by
Index:
Index := RefTypeCombobox.Items.Add(rtrIMT);
    Log('RefTypeCombobox Index: '+Index.ToString+' =
'+RefTypeCombobox.Items[Index]);
    Index := RefTypeCombobox.Items.Add(rtrEOC);
    Log('RefTypeCombobox Index: '+Index.ToString+' =
'+RefTypeCombobox.Items[Index]);

And now it works. The Log entry inserted between the 'Combobox.Items.Add'
caused the problem to go away. 
So I thought it is a timing issue.
- I then replaced the Log entry with a 'Sleep(100)'. But this did NOT work.
- I then added a 'application.processmessages' in between. But this also did
not work.

The only way I can make it work, is to have a Log entry in between. 
This Log entry just processes the string, writes it into a TMemo or a
TRichEdit, depending on a setting.
Now the interesting bit:  When the Log entry is saved to the (Windows DLL)
TRichEdit, it works. 
If the Log entry is saved into a TMemo, it does NOT work.

So the call to RichEdit is causing the Combobox to work correctly.

Any ideas?

PS: The installation directory was selected 19 years ago, because it would not
install on New Zealand Police laptops.
It has stayed like that ever since:
C:\users(username)\AppData\Roaming\SARTrack\ 
Everything is there, except the Debug lots etc. in Documents/SARTrack.
The Registery is not used.