VCL keep / return the original set TextEngine font

TextEngine::SetFont copies the font parameter and then modifies
its color, transparency, fill color and alignment, so passing the
same font again will not be detected as the same font.

Therefore this patch stores the original font in addition to the
modified one and also returns that one on the GetFont call.

This allows us to merge the font setup in VclMultiLineEdit's
ImplInitSettings and ApplySettings into a common function.

Change-Id: I618d283ecd0ae14faf9b87a3aceec6ca1c37b526
Reviewed-on: https://gerrit.libreoffice.org/72788
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
diff --git a/include/vcl/texteng.hxx b/include/vcl/texteng.hxx
index 7e6c9d4..95da903 100644
--- a/include/vcl/texteng.hxx
+++ b/include/vcl/texteng.hxx
@@ -106,6 +106,7 @@ class VCL_DLLPUBLIC TextEngine : public SfxBroadcaster
    std::unique_ptr<LocaleDataWrapper> mpLocaleDataWrapper;

    vcl::Font           maFont;
    vcl::Font           maOrigFont;  // original font from SetFont
    Color               maTextColor;

    sal_Int32           mnMaxTextLen;
@@ -220,7 +221,7 @@ public:
    sal_Int32           GetTextLen( const TextSelection& rSel ) const;

    void                SetFont( const vcl::Font& rFont );
    const vcl::Font&    GetFont() const { return maFont; }
    const vcl::Font&    GetFont() const { return maOrigFont; }

    void                SetLeftMargin( sal_uInt16 n );

diff --git a/include/vcl/vclmedit.hxx b/include/vcl/vclmedit.hxx
index d52d040..23381f5 100644
--- a/include/vcl/vclmedit.hxx
+++ b/include/vcl/vclmedit.hxx
@@ -98,7 +98,10 @@ protected:
    TextView*       GetTextView() const;
    ExtTextEngine*  GetTextEngine() const;

    virtual void ApplySettings(vcl::RenderContext& rRenderContext) override;
    void ApplySettings(vcl::RenderContext&) override;
    void ApplyBackgroundSettings(vcl::RenderContext&, const StyleSettings&);
    void ApplyFontSettings(vcl::RenderContext&, const StyleSettings&);

public:
                    VclMultiLineEdit( vcl::Window* pParent,
                                      WinBits nWinStyle );
diff --git a/vcl/source/edit/texteng.cxx b/vcl/source/edit/texteng.cxx
index 097305d..b6835db 100644
--- a/vcl/source/edit/texteng.cxx
+++ b/vcl/source/edit/texteng.cxx
@@ -170,8 +170,9 @@ void TextEngine::SetActiveView( TextView* pTextView )

void TextEngine::SetFont( const vcl::Font& rFont )
{
    if ( rFont == maFont )
    if (rFont == maOrigFont)
        return;
    maOrigFont = rFont;

    maFont = rFont;
    // #i40221# As the font's color now defaults to transparent (since i35764)
@@ -206,9 +207,9 @@ void TextEngine::SetFont( const vcl::Font& rFont )
    for ( auto nView = mpViews->size(); nView; )
    {
        TextView* pView = (*mpViews)[ --nView ];
        pView->GetWindow()->SetInputContext( InputContext( GetFont(), !pView->IsReadOnly() ? InputContextFlags::Text|InputContextFlags::ExtText : InputContextFlags::NONE ) );
        pView->GetWindow()->SetInputContext(InputContext(maFont, !pView->IsReadOnly()
            ? InputContextFlags::Text|InputContextFlags::ExtText : InputContextFlags::NONE));
    }

}

void TextEngine::SetMaxTextLen( sal_Int32 nLen )
diff --git a/vcl/source/edit/vclmedit.cxx b/vcl/source/edit/vclmedit.cxx
index 9a6d6d0..1419602 100644
--- a/vcl/source/edit/vclmedit.cxx
+++ b/vcl/source/edit/vclmedit.cxx
@@ -913,36 +913,8 @@ WinBits VclMultiLineEdit::ImplInitStyle( WinBits nStyle )
    return nStyle;
}

void VclMultiLineEdit::ApplySettings(vcl::RenderContext& rRenderContext)
void VclMultiLineEdit::ApplyBackgroundSettings(vcl::RenderContext& rRenderContext, const StyleSettings& rStyleSettings)
{
    const StyleSettings& rStyleSettings = rRenderContext.GetSettings().GetStyleSettings();

    // The Font has to be adjusted, as the TextEngine does not take care of
    // TextColor/Background

    Color aTextColor = rStyleSettings.GetFieldTextColor();
    if (IsControlForeground())
        aTextColor = GetControlForeground();

    if (!IsEnabled())
        aTextColor = rStyleSettings.GetDisableColor();

    vcl::Font aFont = rStyleSettings.GetFieldFont();
    aFont.SetTransparent(IsPaintTransparent());
    ApplyControlFont(rRenderContext, aFont);

    vcl::Font theFont = rRenderContext.GetFont();
    theFont.SetColor(aTextColor);
    if (IsPaintTransparent())
        theFont.SetFillColor(COL_TRANSPARENT);
    else
        theFont.SetFillColor(IsControlBackground() ? GetControlBackground() : rStyleSettings.GetFieldColor());

    pImpVclMEdit->GetTextWindow()->SetFont(theFont);
    // FIXME: next call causes infinite invalidation loop, rethink how to properly fix this situation
    // pImpVclMEdit->GetTextWindow()->GetTextEngine()->SetFont(theFont);
    pImpVclMEdit->GetTextWindow()->SetTextColor(aTextColor);

    if (IsPaintTransparent())
    {
        pImpVclMEdit->GetTextWindow()->SetPaintTransparent(true);
@@ -962,10 +934,8 @@ void VclMultiLineEdit::ApplySettings(vcl::RenderContext& rRenderContext)
    }
}

void VclMultiLineEdit::ImplInitSettings(bool bBackground)
void VclMultiLineEdit::ApplyFontSettings(vcl::RenderContext& rRenderContext, const StyleSettings& rStyleSettings)
{
    const StyleSettings& rStyleSettings = GetSettings().GetStyleSettings();

    // The Font has to be adjusted, as the TextEngine does not take care of
    // TextColor/Background

@@ -977,38 +947,36 @@ void VclMultiLineEdit::ImplInitSettings(bool bBackground)

    vcl::Font aFont = rStyleSettings.GetFieldFont();
    aFont.SetTransparent(IsPaintTransparent());
    ApplyControlFont(*this, aFont);
    ApplyControlFont(rRenderContext, aFont);

    vcl::Font TheFont = GetFont();
    vcl::Font TheFont = rRenderContext.GetFont();
    TheFont.SetColor(aTextColor);
    if (IsPaintTransparent())
        TheFont.SetFillColor(COL_TRANSPARENT);
    else
        TheFont.SetFillColor(IsControlBackground() ? GetControlBackground() : rStyleSettings.GetFieldColor());

    pImpVclMEdit->GetTextWindow()->SetFont(TheFont);
    pImpVclMEdit->GetTextWindow()->GetTextEngine()->SetFont(TheFont);
    pImpVclMEdit->GetTextWindow()->SetTextColor(aTextColor);
}

void VclMultiLineEdit::ApplySettings(vcl::RenderContext& rRenderContext)
{
    const StyleSettings& rStyleSettings = rRenderContext.GetSettings().GetStyleSettings();

    ApplyFontSettings(rRenderContext, rStyleSettings);
    ApplyBackgroundSettings(rRenderContext, rStyleSettings);
}

void VclMultiLineEdit::ImplInitSettings(bool bBackground)
{
    const StyleSettings& rStyleSettings = GetSettings().GetStyleSettings();

    ApplyFontSettings(*this, rStyleSettings);

    if (bBackground)
    {
        if (IsPaintTransparent())
        {
            pImpVclMEdit->GetTextWindow()->SetPaintTransparent(true);
            pImpVclMEdit->GetTextWindow()->SetBackground();
            pImpVclMEdit->GetTextWindow()->SetControlBackground();
            SetBackground();
            SetControlBackground();
        }
        else
        {
            if (IsControlBackground())
                pImpVclMEdit->GetTextWindow()->SetBackground(GetControlBackground());
            else
                pImpVclMEdit->GetTextWindow()->SetBackground(rStyleSettings.GetFieldColor());
            // also adjust for VclMultiLineEdit as the TextComponent might hide Scrollbars
            SetBackground(pImpVclMEdit->GetTextWindow()->GetBackground());
        }
    }
        ApplyBackgroundSettings(*this, rStyleSettings);
}

void VclMultiLineEdit::Modify()