Wrong wxChoice size in wxAuiToolBar after DPI was changed (Issue #26779)

[BazaarAcc32]

BazaarAcc32 created an issue (wxWidgets/wxWidgets#26779)

Bug description:

I open an application containing a wxAuiToolBar with a Scale of 100% (this is the recommended scale for my monitor).

This wxAuiToolBar contains two elements: a wxChoice and a wxTextCtrl. After opening the application, I change the Scale to 175%, and the height of the wxChoice element becomes smaller than the height of the wxTextCtrl element. However, if I restart the application, the height of the wxChoice element becomes the same as the height of the wxTextCtrl element.

See scrennshot:

wrong_wxchoice_height_in_auibar.png (view on web)

Expected vs observed behaviour:

This is a bug in the wxAuiToolBar. The height of the wxChoice element should immediately match the height of the wxTextCtrl element, without having to restart the application.

To Reproduce:

#include <wx/wx.h>
#include <wx/choice.h>
#include <wx/aui/auibar.h>

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(nullptr, wxID_ANY, "wxAuiToolBar Demo", wxDefaultPosition, wxSize(400, 150))
    {
        auto* toolbar = new wxAuiToolBar(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxAUI_TB_DEFAULT_STYLE);

        auto* choice = new wxChoice(toolbar, wxID_ANY);
        choice->Append("One");
        choice->Append("Two");
        choice->Append("Three");
        choice->SetSelection(0);

        auto* text = new wxTextCtrl(toolbar, wxID_ANY, "Value", wxDefaultPosition, wxSize(120, -1));

        toolbar->AddControl(choice);
        toolbar->AddSpacer(5);
        toolbar->AddControl(text);

        toolbar->Realize();

        auto* sizer = new wxBoxSizer(wxVERTICAL);
        sizer->Add(toolbar, 0, wxEXPAND);
        SetSizer(sizer);
    }
};

class MyApp : public wxApp
{
public:
    bool OnInit() override
    {
        MSWEnableDarkMode(wxApp::DarkMode_Always);

        auto* frame = new MyFrame();
        frame->Show();

        return true;
    }
};

wxIMPLEMENT_APP(MyApp);

Platform and version information

• wxWidgets version you use: 3.3.3
• wxWidgets port wxMSW
• OS and its version: Windows 11

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[VZ]

vadz left a comment (wxWidgets/wxWidgets#26779)

Hmm, I thought I had fixed this with d5c0625 (Fix appearance of controls in wxAuiToolBar after DPI change, 2026-05-07) but apparently not.

Also, this is almost surely not related to dark mode at all.

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[BazaarAcc32]

BazaarAcc32 left a comment (wxWidgets/wxWidgets#26779)

@vadz
Yes, this issue occurs in both light and dark mode.

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