[lazarus] Non-visual component drawing

[Micha Nelissen]

Mattias Gaertner wrote:

> For win32 the normal paint messages should be enough. Please test, if the
> designer is getting the paint messages and if they are handled at the right
> time (after letting the control draw itself). 
> Maybe we need to adapt the BeginPaint, EndPaint to the designer.

I now understand better. TWinControl.WMPaint needs to send the lm_paint 
through the perform method, not only call WMPaint.

However, now I have another problem: the designerdevicecontext.FDCSize 
is (0,0) and stays so. The line GetDeviceSize (designerprocs.pas:286) 
never gets executed. Can you help me?

Micha.