Resolves: tdf#160159 update spellchecking area colors when style changes

so for the case of using "automatic" for the document background the
spelling checking textbox background area updates to match

Change-Id: I8723afb946176596b0a5fa43aa3bb3c036dee12c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165554
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
diff --git a/cui/source/dialogs/SpellDialog.cxx b/cui/source/dialogs/SpellDialog.cxx
index dfdad98..9dd877f 100644
--- a/cui/source/dialogs/SpellDialog.cxx
+++ b/cui/source/dialogs/SpellDialog.cxx
@@ -1152,6 +1152,13 @@ void SentenceEditWindow_Impl::SetDrawingArea(weld::DrawingArea* pDrawingArea)

    m_xEditEngine->SetStatusEventHdl(LINK(this, SentenceEditWindow_Impl, EditStatusHdl));

    SetDocumentColor(pDrawingArea);
}

void SentenceEditWindow_Impl::SetDocumentColor(weld::DrawingArea* pDrawingArea)
{
    if (!pDrawingArea || !m_xEditView || !m_xEditEngine)
        return;
    // tdf#142631 use document background color in this widget
    Color aBgColor = svtools::ColorConfig().GetColorValue(svtools::DOCCOLOR).nColor;
    OutputDevice& rDevice = pDrawingArea->get_ref_device();
@@ -1160,6 +1167,12 @@ void SentenceEditWindow_Impl::SetDrawingArea(weld::DrawingArea* pDrawingArea)
    m_xEditEngine->SetBackgroundColor(aBgColor);
}

void SentenceEditWindow_Impl::StyleUpdated()
{
    SetDocumentColor(GetDrawingArea());
    WeldEditView::StyleUpdated();
}

IMPL_LINK_NOARG(SentenceEditWindow_Impl, EditStatusHdl, EditStatus&, void)
{
    SetScrollBarRange();
diff --git a/cui/source/inc/SpellDialog.hxx b/cui/source/inc/SpellDialog.hxx
index fdf5e81..81d68e2 100644
--- a/cui/source/inc/SpellDialog.hxx
+++ b/cui/source/inc/SpellDialog.hxx
@@ -71,6 +71,7 @@ private:

protected:
    virtual bool    KeyInput( const KeyEvent& rKEvt ) override;
    virtual void    StyleUpdated() override;

public:
    SentenceEditWindow_Impl(std::unique_ptr<weld::ScrolledWindow> xScrolledWindow);
@@ -120,6 +121,8 @@ public:
    void            MoveErrorEnd(tools::Long nOffset);

    void            ResetIgnoreErrorsAt()   { m_aIgnoreErrorsAt.clear(); }

    void            SetDocumentColor(weld::DrawingArea* pDrawingArea);
};

// class SvxSpellDialog ---------------------------------------------