[Openmcl-devel] Visual Bugs in the IDE

Ron Garret ron at awun.net
Wed May 20 20:28:29 UTC 2009


For those who are wondering, what led me to discover this odd behavior  
(which seems to have been fixed already) was trying to count how many  
carriage returns were needed to reproduce the syntax-coloring bug  
(which also seems to have been fixed) by copying the string into the  
listener and calling (length *).

rg

On May 20, 2009, at 1:25 PM, Laughing Water wrote:

> Sorry, but I just can't resist -
>
> In picturing what might lead you to type a long run of carriage  
> returns, I have this image of you sleeping and drooling on the  
> keyboard.
>
> Sorry again!
>
> Laughing Water
>
>
> On May 20, 2009, at 1:44 PM, Ron Garret wrote:
>
>>
>> On May 20, 2009, at 2:43 AM, John McAleely wrote:
>>
>>>
>>> - Opening the file 'md5.lisp' (sourced from the internet some time  
>>> ago, attached), and scrolling it with the mouse/vertical scroll  
>>> bar, resulted in the syntax colouring inverting from time to time  
>>> (code became blue, strings black). I could not reproduce this with  
>>> other files, but it was very reliable with md5.lisp across  
>>> multiple invocations of the IDE. This occurs as the function  
>>> 'md5sum-stream' is in the visible area, near the center of the  
>>> window.
>>>
>>
>> I've produced what I believe to be a minimal reproduction of this  
>> bug (file enclosed).  You can *add* just about anything to this  
>> minimal file and still produce the bug, but removing any of the  
>> characters in the file seems to make the problem go away.
>>
>> Note that the file contains a long run of blank lines.  Those are  
>> necessary.  The bug depends on the size of the window in which the  
>> file is being displayed.  The more blank lines (actually they don't  
>> have to be blank, but the carriage returns have to be there) the  
>> larger the window can be and still manifest the problem.
>>
>> In the course of investigating this I discovered the following  
>> charming behavior: if you type a string into the listener that  
>> consists of a carriage return, an open-paren, and then a long run  
>> of carriage returns (60 or so), the listener will become  
>> unresponsive (i.e. subsequent forms will fail to be evaluated).
>>
>> It's been a fun morning.
>>
>> rg
>>
>> <foo.lisp>
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