[Lazarus] Event with changed signature can be loaded without error

[Mattias Gaertner]

On Fri, 12 Apr 2019 19:35:03 +0200
Werner Pamler via lazarus <lazarus at lists.lazarus-ide.org> wrote:

> I don't know: is this changed or am I fooled by my memory? I was
> rather sure that when the signature of a published event is changed,
> forms saved with the old signature cannot be read without error. But
> now I notice that this is not true any more.

Loading a form only checks the name, not the signature.

 
> The version of TAChart which I just committed to trunk had to change
> the signature of the TChartDataPointDrawEvent event from
> 
>     procedure (ASender: TDataPointDrawTool) of object;
> 
> to
> 
>   procedure (ASender: TDataPointDrawTool;  ADrawer: IChartDrawer) of
> object;
> 
> Testing this with the demo in folder 
> (lazarus)/components/tachart/demo/tools in which the event is handled
> I was expecting an error - but no, the program compiles and runs fine
> as if nothing had changed.
> 
> Am I missing something?

You were just lucky.

Mattias