Controls flicker/disappear in AUI toolbar when resizing sashes on MSW (Issue #26142)

[dsa-t]

dsa-t created an issue (wxWidgets/wxWidgets#26142)

Description

Add to MyFrame::MyFrame in auidemo.cpp:

    wxBitmapComboBox* choice = new wxBitmapComboBox(tb4, ID_SampleItem + 35, wxEmptyString, wxDefaultPosition,
        wxDefaultSize, 0, nullptr,
        wxCB_READONLY);

    choice->Append("Good choice", tb4_bmp1);
    choice->Append("Better choice", tb4_bmp1);
    tb4->AddControl(choice);
    tb4->Realize();

and #include "wx/bmpcbox.h"

See flickering controls in aui toolbars when resizing sashes:

https://github.com/user-attachments/assets/7e5aef25-031e-4f03-9f79-ac232b4cd04e

Flickering is seen on other UI elements too, but less pronounced.

Platform and version information

• wxWidgets version you use: 3.3 (master)
• wxWidgets port you use: wxMSW
• OS and its version: Windows 11

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