[QGIS-Developer] how compatible .qml files are ?

[Matthias Kuhn]

On 9/2/19 12:02 PM, Sandro Santilli wrote:
> On Sun, Sep 01, 2019 at 08:19:18AM +1000, Nyall Dawson wrote:
>> On Sat, 31 Aug 2019 at 17:02, Sandro Santilli <strk at kbt.io> wrote:
>>> It would sound like QgsProjectFileTransform::updateRevision should throw
>>> an exception when unable to do what's been asked for ?
>> In this case QgsProjectFileTransform will be a red herring - there was
>> never a transform in place for this code, so there won't be any clues
>> there.
> You mean QgsProjectFileTransform class never dealt with style configured in
> project files ? Or what does "for this code" mean, exactly ?

Possibly. Sometimes there was/is legacy loading code directly inside the 
readXml classes.

If you want to work on it now however, QgsProjectFileTransform sounds 
like the path to go.

I reckon it was removed mainly because it cluttered the readXml code in 
the classes.

Bests

Matthias

>
> Regarding dropping backward compatibility, you say:
>
>> this was a wide group decision, with consensus from
>> all currently active QGIS developers and maintainers. It was deemed
>> unnecessary at this point in time.
> Do you have a link to a mailing list thread where decision taking
> process was conducted ? Just in case it has some hints about how
> to fix this backward compatibility problem as QGIS moves forward.
>
> --strk;
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