[Seaside] exceptions while debugging - frozen UI

[Holger Kleinsorgen]

>> - UI is frozen, image is still alive
> 
> Hi Holger,
> 
> I've run into this myself. I haven't been able to pin down the exact 
> cause, but I believe it's something like this: by opening a debugger, 
> you are effectively transferring execution of the callback from a 
> Seaside process to the UI process. When you step over the method that 
> produces an HTTP response, Seaside uses an escape continuation to 
> replace the stack of the UI process with the stack of the process that 
> was serving the HTTP request. Once the response has been sent to the 
> browser, that process exits, leaving you without a UI process.
> 
> It's probably not exactly like that, and probably the exact steps are 
> different in the different versions of Seaside, but the effect is always 
> that the UI process is destroyed when the HTTP response is sent out. 
> Fortunately, there's an easy work around. Just press cmd-. to create a 
> new UI process and you're fine.


thank you both for the explanation and the solution.

 > And that's for Seaside 2.8 (what you are probably using):

exactly