[Win32] When minimizing/restoring a modal form, an unnecessary Application icon appears
* Lazarus/FPC Version: trunk (6ed6e91651)
* Operating System: Windows 11
* CPU / Bitness: x64
## What happens
I call the modal form via `ShowModal` while the main form is not yet displayed. This form has a property `ShowInTaskBar := stAlways`. And minimizing and maximizing it causes an unwanted Application.Handle icon to appear in the taskbar. This behavior is incorrect because the modal form is not the main form.
## What did you expect
I have developed a fix that causes the correct behavior in both modes of `Application.MainFormOnTaskBar`. (my previous bug report contained incorrect information). Also this fix prevents the bug where `Application.MainFormOnTaskBar := False` (default mode) prevents non-modal forms from being minimized.
[changes.patch](/uploads/0fc57f2e3f9bc12722f2b94f6d72be53/changes.patch)
Two videos, as it was and as it became:
<details><summary>Click to expand</summary>
</details>
## Steps to reproduce
```
var
f: TForm;
begin
RequireDerivedFormResource:=True;
Application.Scaled:=True;
Application.Initialize;
f := TForm.CreateNew(nil);
f.ShowInTaskBar:=stAlways;
f.ShowModal; // minimize this form
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
```
issue