IVsPackageDefinedTextMarkerType - include line break in text marker

Hello,

I need to make a specific text marker in pre-VS2010 IDEs.

I am working on VS feature that provides some language specific selections
and I need to preview a result in text editor without using of a real selection.
Possibly with color that user can define/modify in options.

So I decided to implement custom text line marker as follows:

class MyMarkerType :
	public IVsPackageDefinedTextMarkerType,
	public IVsMergeableUIItem,
	public IVsHiColorItem
{
...
};

// IUnknown
HRESULT STDMETHODCALLTYPE
MyMarkerType::QueryInterface(/* [in] */ REFIID riid,
/* [iid_is][out] */ void **ppvObject)
{
	if (riid == IID_IUnknown ||
		riid == IID_IVsPackageDefinedTextMarkerType)
	{
		*ppvObject = this;
		AddRef();
		return S_OK;
	}
	else if (riid == IID_IVsMergeableUIItem)
	{
		*ppvObject = static_cast<IVsMergeableUIItem*>(this);
		AddRef();
		return S_OK;
	}
	else if (riid == IID_IVsHiColorItem)
	{
		*ppvObject = static_cast<IVsHiColorItem*>(this);
		AddRef();
		return S_OK;
	}

	*ppvObject = NULL;
	return E_NOINTERFACE;
}

ULONG STDMETHODCALLTYPE
MyMarkerType::AddRef()
{
	return InterlockedIncrement(&mRefCount);
}

ULONG STDMETHODCALLTYPE
MyMarkerType::Release()
{
	const LONG cRef = InterlockedDecrement(&mRefCount);
	if (cRef == 0)
		delete this;
	return cRef;
}

// IVsPackageDefinedTextMarkerType
HRESULT STDMETHODCALLTYPE
MyMarkerType::GetVisualStyle(/* [out] */ DWORD *pdwVisualFlags)
{
	*pdwVisualFlags = MV_BORDER | MV_COLOR_ALWAYS;
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetDefaultColors(/* [out] */ COLORINDEX *piForeground,
/* [out] */ COLORINDEX *piBackground)
{
	*piBackground = CI_SYSSEL_BK;
	*piForeground = CI_SYSSEL_FG;
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetDefaultLineStyle(/* [out] */ COLORINDEX *piLineColor,
/* [out] */ LINESTYLE *piLineIndex)
{
	*piLineIndex = LI_SOLID;
	*piLineColor = CI_BLACK;
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetDefaultFontFlags(/* [out] */ DWORD *pdwFontFlags)
{
	*pdwFontFlags = FF_DEFAULT;
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::DrawGlyphWithColors(/* [in] */ HDC /*hdc*/,
/* [in] */ RECT * /*pRect*/,
/* [in] */ long /*iMarkerType*/,
/* [in] */ IVsTextMarkerColorSet * /*pMarkerColors*/,
/* [in] */ DWORD /*dwGlyphDrawFlags*/,
/* [in] */ long /*iLineHeight*/)
{
	return E_NOTIMPL;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetBehaviorFlags(/* [out] */ DWORD *pdwFlags)
{
	*pdwFlags = MB_DEFAULT;
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetPriorityIndex(/* [out] */ long *piPriorityIndex)
{
	*piPriorityIndex = 751; // one higher than the Brace Marker
	return S_OK;
}


// IVsMergeableUIItem
HRESULT STDMETHODCALLTYPE
MyMarkerType::GetCanonicalName(/* [out] */ BSTR *pbstrNonLocalizeName)
{
	CComBSTR name(L"My marker");
	*pbstrNonLocalizeName = name.Detach();
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetDescription(/* [out] */ BSTR *pbstrDesc)
{
	CComBSTR desc(L"My marker");
	*pbstrDesc = desc.Detach();
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetDisplayName(/* [out] */ BSTR *pbstrDisplayName)
{
	CComBSTR name(L"VMy marker");
	*pbstrDisplayName = name.Detach();
	return S_OK;
}

HRESULT STDMETHODCALLTYPE
MyMarkerType::GetMergingPriority(/* [out] */ long *piMergingPriority)
{
	*piMergingPriority = 0x2001;
	return S_OK;
}

//IVsHiColorItem
HRESULT STDMETHODCALLTYPE
MyMarkerType::GetColorData(/* [in] */ VSCOLORDATA cdElement,
/* [out] */ COLORREF *pcrColor)
{
	HRESULT retval = E_NOTIMPL;
	*pcrColor = 0;

	// Indicates that the returned RGB value is an index into a predefined list of colors.
	// http://msdn.microsoft.com/sk-sk/library/microsoft.visualstudio.textmanager.interop.ivshicoloritem.aspx
	const UINT COLOR_INDEXED = 0x01000000;

	// Once we could want to use different colors,
	// so this method may become handy

	switch (cdElement)
	{
	case CD_BACKGROUND:
		//*pcrColor = COLOR_INDEXED | CI_SYSSEL_BK;
		*pcrColor = ::GetSysColor(COLOR_HIGHLIGHT);
		retval = S_OK;
		break;

	case CD_FOREGROUND:
	case CD_LINECOLOR:
		//*pcrColor = COLOR_INDEXED | CI_SYSSEL_FG;
		*pcrColor = ::GetSysColor(COLOR_HIGHLIGHTTEXT);
		retval = S_OK;
		break;

	default:
		retval = E_INVALIDARG;
		break;
	}
	return retval;
}

However I am getting unwanted results.

What I get:

What I want:

As you can see, on picture labeled "What I get", marker selects whole lines.
I tried also to create a unique line marker for each line, but result was same
when span contained also linebreak. If span did not contain linebreak, markes
seem good, however marker w/o linebreaks is unwanted in this case.

All markers were created using IVsTextLines::CreateLineMarker method.

Any suggestion to have markers as on picture "What I want"?

Thanks in advance,
Dusan