wxAuiToolBar has wrong size after window maximized & scale updated (Issue #26807)

[BazaarAcc32]

BazaarAcc32 created an issue (wxWidgets/wxWidgets#26807)

Description

If you create a wxAuiToolBar containing an element with a proportion of 1, then maximize the main frame and then change the Scale from, say, 100% to 175%, you'll see that the elements with a proportion of 1 collapse.

In my example below, this can be seen in the wxAuiToolBar::AddStretchSpacer and wxTextCtrl elements.

Expected vs observed behaviour:

wxAuiToolBar elements should not collapse, but should take up the full available width.

To Reproduce:

1. Compile the code below
2. Maximize the width of the main window by clicking on the rectangle in the upper right corner
3. Change the Scale value from 100% to 175%
   Note: After wxAuiToolBar collapsed, if we restore the previous size, the display will be corrected

Here is code for test

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

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(
            nullptr,
            wxID_ANY,
            "wxAuiToolBar example",
            wxDefaultPosition,
            wxSize(700, 200))
    {
        auto* mainSizer = new wxBoxSizer(wxVERTICAL);

        auto* toolbar1 = new wxAuiToolBar(
            this,
            wxID_ANY,
            wxDefaultPosition,
            wxDefaultSize,
            wxAUI_TB_HORIZONTAL | wxAUI_TB_PLAIN_BACKGROUND);

        auto* label1 = new wxStaticText(toolbar1, wxID_ANY, "Name:");
        auto* textCtrl = new wxTextCtrl(toolbar1, wxID_ANY);

        toolbar1->AddControl(label1);
        auto* textItem = toolbar1->AddControl(textCtrl);
        textItem->SetProportion(1);

        toolbar1->Realize();

        auto* toolbar2 = new wxAuiToolBar(
            this,
            wxID_ANY,
            wxDefaultPosition,
            wxDefaultSize,
            wxAUI_TB_HORIZONTAL);

        auto* label2 = new wxStaticText(toolbar2, wxID_ANY, "Left");
        auto* label3 = new wxStaticText(toolbar2, wxID_ANY, "Right");

        toolbar2->AddControl(label2);
        toolbar2->AddStretchSpacer(1);
        toolbar2->AddControl(label3);

        toolbar2->Realize();

        mainSizer->Add(toolbar1, 0, wxEXPAND);
        mainSizer->Add(toolbar2, 0, wxEXPAND);

        SetSizer(mainSizer);
        Layout();
    }
};

class MyApp : public wxApp
{
public:
    bool OnInit() override
    {
        auto* frame = new MyFrame();
        frame->Show();
        return true;
    }
};

wxIMPLEMENT_APP(MyApp);

Platform and version information

• wxWidgets version you use:
• wxWidgets port you use:
• OS and its version:
  • GTK version:
  • Which GDK backend is used:
  • Desktop environment :
  • Current theme:

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