This PR was about the symbology, but we noticed there are many other parts of the QGS file which are not backward compatible. If I'm not wrong : - a WMS shortname on a group made with QGIS 3.20 can not be read with QGIS 3.18. - field server configuration made with QGIS 3.16 can not be read with QGIS 3.14 - ...
These settings, (which are way older in the QGIS development, i.e already present in QGIS 2), are just lost when read with a lower version of QGIS. And obviously, all new features, options, checkbox etc are lost as well. I understand, it's not easy to migrate a lot of softwares and to follow all their versions in a big organization. But using a QGIS recent version to write a file and then ask a lower version QGIS to read is, anyway, leading to some reading issues I would say. The PR was indeed trying to keep some backward compatibility about symbology, which was nice, but there are other settings which are lost already, so I would be careful with other settings in general ;-) Just for your information, but I noticed these other settings as well ;-) Le mar. 2 mai 2023 à 09:38, FERRATON Alain (Adjoint au chef de groupe) - SG/DNUM/MSP/DS/GSG via QGIS-Developer <qgis-developer@lists.osgeo.org> a écrit : > Hi Denis, > > Thanks for your feedback. > > I think that re-introducing backwards compatibility in QGIS 3.28 would be > valuable for our services. The size of the project files is not too > critical in my opinion compared to the size of the data files, which are > usually much larger. > > Is this possible for QGIS 3.28.7? > > Alain > --- > > *Alain FERRATON* > Adjoint au chef de groupe > MSP/DS/GSG > Direction du numérique | Secrétariat général > > MAN 7, rue René Viviani 44200 NANTES > Bureau : MAN étage 1 plateau B > Tel : +33 240128408 - Mobile : +33 671794593 > www.ecologie.gouv.fr > [image: Marianne] Secrétariat général > MINISTÈRES > TRANSITION ÉCOLOGIQUE > COHÉSION DES TERRITOIRES > TRANSITION ÉNERGÉTIQUE > MER > [image: liberté, égalité, fraternité] > > > Le 28/04/2023 10:02, > denis.rouzaud a écrit : > > Hi Alain, > > Yes, the backward compatibility to 3.16 has been removed in 3.28, > considering there was a LTR in between and that 3.16 was not maintained for > more than a year. > > The PR is here https://github.com/qgis/QGIS/pull/45143 > > I am not sure if it's possible to do it with a plugin. > An approach would be to revert this in the 3.28 branch to give more time. > I have no strong opinion here. The main motivation to drop compatibility > was the size of the project file and redundancy of information (manually > editing the file gets harder). > > Denis > > > Le jeu. 27 avr. 2023, 09:08, FERRATON Alain (Adjoint au chef de groupe) - > SG/DNUM/MSP/DS/GSG via QGIS-Developer <qgis-developer@lists.osgeo.org> a > écrit : > >> Hi >> >> A polygon layer saved in a project file with QGIS 3.28 is systematically >> opened in blue in QGIS 3.16 (the style is lost). >> >> There has been a change in the storage of style in project files >> introduced in QGIS 3.22. >> >> QGIS 3.22 save the style in both formats (<Option.../> >> >> and <prop k=.../> >> >> (see the attachment) >> >> This is no longer the case in QGIS 3.28 >> >> We have a heterogeneous QGIS version park. The non backward compatibility >> of style is an important brake to migrate progressively our services to >> QGIS 3.28 >> >> We could consider developing or having developed a plugin to ensure this >> backward compatibility. >> Is this possible? What would be the best way to proceed? Can we find >> documentation on the storage of styles in QGIS project files and on its >> evolution? >> (I didn't find anything relevant by searching on the internet). >> >> Sincerely, >> -- >> >> *Alain FERRATON* >> Adjoint au chef de groupe >> MSP/DS/GSG >> Direction du numérique | Secrétariat général >> >> MAN 7, rue René Viviani 44200 NANTES >> Bureau : MAN étage 1 plateau B >> Tel : +33 240128408 - Mobile : +33 671794593 >> www.ecologie.gouv.fr >> [image: Marianne] Secrétariat général >> MINISTÈRES >> TRANSITION ÉCOLOGIQUE >> COHÉSION DES TERRITOIRES >> TRANSITION ÉNERGÉTIQUE >> MER >> [image: liberté, égalité, fraternité] >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >
_______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
