[Qgis-developer] editing expressions defining virtual fields seems erratic

[Janneke van Dijk]

Dear list,

In a polygon shapefile I'm seeing inconstistent behaviour in virtual 
fields. The attached project and shapefile has reduced it to it's 
simplest form: the shapefile contains two virtual fields, the first one 
containing the expression 1 (integer) and the second the expression 2 
(integer). However, when I want to edit the expression for the fields, 
the first field does not give a problem. For the second field I click on 
the 'expression' to open the expression builder, but the expression 
shown in the expression builder equals 1. I have not been able to find 
any pattern in when it happens/for what type of expressions. This 
example is the most simple form of the unexpected behaviour, but I have 
seen it with more complicated expressions as well. Sometimes after 
trying to edit one of these 'erratic' expressions QGIS closes with a 
minidump being written error message. Again, not always.

Anyone have any idea why this might happen and how to work around it?

Looking forward to some thoughts...
Janneke


On 13/05/2016 11:36, Nyall Dawson wrote:
> On 13 May 2016 at 17:53, Janneke van Dijk<janneke.qgis at gmail.com>  wrote:
>> Dear list,
>>
>> Using QGIS 2.14.2 on Windows 7 I get the following error message when
>> zooming out on a shapefile layer that has labels switched on:
>>
>> GEOS
>> Exception: IllegalArgumentException: Invalid number of points in LinearRing
>> found 3 - must be 0 or >= 4
>>
>> It seems to be an old bug (https://hub.qgis.org/issues/9375) that was fixed
>> 2 years ago.
>>
>> It doesn't seem to cause any problems otherwise. Anyone else have this
>> issue? Should I file a new bug report?
> Hi Janneke,
>
> Best thing to do is file an issue athttp://hub.qgis.org/issues  with a
> copy of your data + sample project. If you do that this bug should be
> easy for us to squash!
>
> Thanks,
> Nyall
>
>
>> Regards,
>> Janneke
>>
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