Resolves: tdf#149858 embedded starmath not using correct initial zoom

since...

commit ea21b870f8549d0110ef65187af50694a06458ca
Date:   Mon Apr 19 15:22:22 2021 +0100

    weld SmGraphicWindow

where the outer Window is not directly drawn into any more

Change-Id: I70f45590f0fb7ff2f7af80da8873d580d219aca4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/138297
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/starmath/inc/view.hxx b/starmath/inc/view.hxx
index 555beca..45df0f4 100644
--- a/starmath/inc/view.hxx
+++ b/starmath/inc/view.hxx
@@ -53,9 +53,6 @@ private:

    DECL_LINK(ScrollHdl, weld::ScrolledWindow&, void);

    void SetGraphicMapMode(const MapMode& rNewMapMode);
    MapMode GetGraphicMapMode() const;

public:
    explicit SmGraphicWindow(SmViewShell& rShell);
    virtual void dispose() override;
@@ -74,6 +71,9 @@ public:
    virtual void Resize() override;
    void ShowContextMenu(const CommandEvent& rCEvt);

    void SetGraphicMapMode(const MapMode& rNewMapMode);
    MapMode GetGraphicMapMode() const;

    SmGraphicWidget& GetGraphicWidget()
    {
        return *mxGraphic;
diff --git a/starmath/source/view.cxx b/starmath/source/view.cxx
index 71dd3bc..3967697 100644
--- a/starmath/source/view.cxx
+++ b/starmath/source/view.cxx
@@ -1100,8 +1100,12 @@ void SmViewShell::InnerResizePixel(const Point &rOfs, const Size &rSize, bool)
    if ( !aObjSize.IsEmpty() )
    {
        Size aProvidedSize = GetWindow()->PixelToLogic(rSize, MapMode(MapUnit::Map100thMM));
        SfxViewShell::SetZoomFactor( Fraction( aProvidedSize.Width(), aObjSize.Width() ),
                        Fraction( aProvidedSize.Height(), aObjSize.Height() ) );
        Fraction aZoomX(aProvidedSize.Width(), aObjSize.Width());
        Fraction aZoomY(aProvidedSize.Height(), aObjSize.Height());
        MapMode aMap(mxGraphicWindow->GetGraphicMapMode());
        aMap.SetScaleX(aZoomX);
        aMap.SetScaleY(aZoomY);
        mxGraphicWindow->SetGraphicMapMode(aMap);
    }

    SetBorderPixel( SvBorder() );