Control size documentations

[Descolada]

Firstly, Control.GetPreferredSize()

Eto/src/Eto/Forms/Controls/Control.cs

Line 846 in d63474c

public SizeF GetPreferredSize() => GetPreferredSize(SizeF.PositiveInfinity);

) is undocumented.

I'm also having issues with the Control.Size property: before the form is shown it always reports (1, 1) even if I assign to it and then immediately read the property. However, once the form is shown the size I assigned to it will take effect. Likely this is not a bug and should just be documented: I'm assuming Size saves the desired size internally but reports the actual size (which is (1,1) until the form is shown) until it takes effect. I'm testing with Eto.Forms GTK.
Side-note: personally I'd prefer the sentinel value to be (-1, -1) and if the user has assigned an explicit size, then that. Of course only before the control has been shown, and real size afterwards.