[Lazarus] Inconsistent ScrolledClientRect calculation

[Hans-Peter Diettrich]

Felipe Monteiro de Carvalho schrieb:
> On Fri, Oct 7, 2011 at 6:34 AM, Hans-Peter Diettrich
> <DrDiettrich1 at aol.com> wrote:
>> The ambiguous use of TRect, with either BottomRight or WidthHeight in the
>> second TPoint, often leads to misunderstandings and flawed code (as above).
>> It were helpful when type alias would be introduced and used, or when the
>> argument names would indicate the current content of an TRect.
> 
> Where exactly is TRect used to hold the Width and Height? File and Line.

TControl.GetClientRect
(controls.inc 1525..)

BoundsRect and ClientRect contain different information, despite the 
similar name and type.

A similar problem exists with mouse coordinates, which can be either 
screen or client coords.

DoDi