Generic wxCaret does not scroll (Issue #26282)

[Steve Cornett]

stevecor created an issue (wxWidgets/wxWidgets#26282)

On Linux, when a window is scolled, the caret incorrectly stays at the same screen location. The caret should move with the client area, as on Windows.

Incorrect behavior on Linux:
linux3.gif (view on web)

Correct behavior on Windows:
windows.gif (view on web)

To repro, run the program below on Windows and on Linux. Operate the scroll bar up and down.

Observed with wxWidgets 3.3.2, Ubuntu 24.04, Windows 11

#include <wx/wx.h>
#include <wx/caret.h>

struct ScrolledCanvas: public wxScrolled<wxWindow> {
    ScrolledCanvas(wxWindow* parent)
        : wxScrolled<wxWindow>(parent)
    {
        wxCaret* caret = new wxCaret(this, 10, 12);
        caret->Show();
        caret->Move(20, 24);
        SetVirtualSize(120, 900);
        SetScrollRate(12, 12);
        SetBackgroundColour(*wxWHITE);
        SetCaret(caret);
        Bind(wxEVT_PAINT, &ScrolledCanvas::OnPaint, this);
    }
    void OnPaint(wxPaintEvent&) 
    {
        wxPaintDC dc(this);
        PrepareDC(dc);
        dc.Clear();
        dc.DrawText("hello\nworld", 20, 20);
    }
};

struct MainFrame: public wxFrame {
    MainFrame()
        : wxFrame(nullptr, wxID_ANY, "Example", wxDefaultPosition, wxSize(200, 150))
    {
        new ScrolledCanvas(this);
    }
};

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

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