[Lazarus] TColor and Alpha channel support

[Ondrej Pokorny]

On 26.09.2016 13:33, Mattias Gaertner via Lazarus wrote:
> The idea is to use the FPColor property for alpha, but that is not
> implemented yet by the LCL interfaces. Hmm, I wonder how hard it would
> be...

Speaking from my experince, nearly impossible :(

It doesn't really make sense for me anyway because windows with handles 
(TWinControl descendants) don't support alpha-transparency on Windows.

For me it would be just a source of bugs and incomplete WS-dependent 
implementations.

Ondrej