[Lazarus] GroupBox AutoSize issues

[Mattias Gaertner]

On Tue, 17 Mar 2015 16:12:30 +0000
Henry Vermaak <henry.vermaak at gmail.com> wrote:

> Hi
> 
> A while ago we managed to fix the GroupBox auto sizing not taking the
> length of the caption into account.  I've been using the fixes_1_2
> branch and that's working OK.
> 
> I switched to fixes_1_4 and started seeing some strange behaviour.
> Initially it appears that the auto sizing works correctly (see
> groupbox1.png) but when you resize the window it changes and cuts the
> caption off (see groupbox2.png).  It doesn't resize again after that.
> This only happens when you've got some anchors set.
> 
> Does anyone know what could have caused this?  If not I'll have to
> bisect, which I'd rather avoid!

The LCL gtk2 interface computed the preferred size of a groupbox
including the child controls, which lead to a loop.
We need another way to compute the size of a groupbox without the child
controls.

Mattias