[Tests][Server] WMS GetPrint group

[rldhont]

Description

Add WMS GetPrint group test.

[rldhont]

Try to fix #35107

[rldhont]

I have ran the test on branch release-3_4 and it passes. So it is a regression.

[rldhont]

The rendered image seems to display all layers and not only the layers in the group

[nyalldawson]

@rldhont sounds like #35203 ?

[rldhont]

@nyalldawson how #35203 has been fixed ?

[nyalldawson]

Yes. But it requires projects to be re-saved to apply the fix

[rldhont]

@nyalldawson you mean the fix is in the QGIS XML Project ?

[nyalldawson]

@rldhont

you mean the fix is in the QGIS XML Project ?

yes - the issue was caused in projects saved in a limited window of QGIS versions, after #33099 was applied and before #34794 was merged. The only solution is to load the project post #34794, fix the theme, and resave.

[rldhont]

@nyalldawson There are no themes in the test project, and I found something was missing in the code.

[rldhont]

@dmarteau @elpaso @pblottiere can you help me to fix this issue. I have probably found where the issue comes from but my fix segfault.

[rldhont]

@pblottiere I have found the commit that create the regression 5c874ca

This commit removes QgsRenderer::stylizedLayers in which groups nickname is transformed into a QgsMapLayer list. Can you take a look at my fix ?

[pblottiere]

Hi @rldhont,

Can you take a look at my fix ?

The rationale looks good. Waiting for Travis then 🤞

[rldhont]

@pblottiere thanks for the review

[rldhont]

Yeah travis is happy