[Qgis-developer] Virtual Fields - Allow adding fields out of edit mode

[Matthias Kuhn]

Hi,

I merged a commit today that fixes some problems with virtual fields, in 
particular a crash when removing a virtual field.
As the virtual fields do not work on the data provider, they are not 
directly linked to edit mode being turned on. This also allows to add 
virtual fields on data providers that do not allow to add additional 
fields. This led to a change in the GUI, that you are also allowed to 
add fields when edit mode is turned off. I added an info, that editing 
mode will be turned on, when adding real (provider) fields on the add 
field dialog.
However, I am not sure how intuitive the current behavior is. As we are 
approaching the final release date, I thought I'd explicitly point out 
this change and ask for feedback so we can take measures if there is 
hesitation to this approach.

Please share your impression and if you disagree with the current 
approach it would be highly welcome if you could outline an improved way 
of tackling this.

Matthias