<summary>
Apply a custom font fallback onto layout. If none is specified,
layout uses the system fallback list.
</summary>
<param name="fontFallback">Custom font fallback created from
IDWriteFontFallbackBuilder::CreateFontFallback or
IDWriteFactory2::GetSystemFontFallback.</param>
<returns>
Standard HRESULT error code.
</returns>
<summary> Apply a custom font fallback onto layout. If none is specified, layout uses the system fallback list. </summary> <param name="fontFallback">Custom font fallback created from IDWriteFontFallbackBuilder::CreateFontFallback or IDWriteFactory2::GetSystemFontFallback.</param> <returns> Standard HRESULT error code. </returns>