[Lazarus] TControl.InvalidatePreferredSize loop detected

[John]

On 26/10/2010 6:59 PM, Mattias Gaertner wrote:
> On Tue, 26 Oct 2010 17:17:00 +1100
> John<jszcmpr at netspace.net.au>  wrote:
>
>> Can anyone enlighten me as to the likely cause(es) of a "TControl.InvalidatePreferredSize loop detected" exception, and how one may debug it ?  It is occurring in a frame, if that is significant, and it is the frame that is specified in the exception.  Looking at the code in TControl.InvalidatePreferredSize, it would appear that the frame must not have a parent, but as it is occurring in the form designer, it is difficult to debug.  I think it may not be happening at run time, but as it started happening at  design time while I was in the middle of some "structural changes", it is hard to get a lot of sense out of the program at run time.
>>
>> Environment is WinXP SP3,  fpc SVN 16114 Laz SVN 27864.  (But it also occurred on Laz SVN from a few weeks ago)
> Do you use only standard LCL controls?
>
> Mattias
The frame contains a TLabel, a TButtonPanel, a TBitBtn, a couple of 
TRadioGroups, and some db Controls - TDBGrid, (with defined columns) 
TDBNavigator,  TDBMemo.  I guess these are all considered standard ?  I 
don't think I have used any controls that didn't come with Lazarus in 
the whole project.

thanks,
John Sunderland