Layers added using a `.qlr` file cannot be added to an open Elevation Profile View

[PeterDrexel]

What is the bug or the crash?

Using "Log = QgsLayerDefinition().loadLayerDefinition("pathtofile/xxx.qlr", QgsProject.instance(),QgsProject.instance().layerTreeRoot())" in a Script or in the Python-Console works well to open some elevation data into the layer table and the main view. But if I want to see the same Data in an Elevation-Profile-View the dataset does not show up in an already opened Elevation-Profile-View. I have to close and reopen the Elevation Profile View to see the loaded Dataset.

Steps to reproduce the issue

Start QGIS

• Load any Elevation Data and export a qlr-file for the Elevation-Dataset. Unload (Close) the Dataset again.
• Load another Elevation Dataset
• Open an Elevation-Profile-View (View - Elevation-Profile) and draw a Line - you can see the profile plot for the loaded dataset.
• Keep the Elevation-Profile-View opened and Run "Log = QgsLayerDefinition().loadLayerDefinition("pathtofile/xxx.qlr", QgsProject.instance(),QgsProject.instance().layerTreeRoot())" in the python console - adjust the path to your saved .qlr-File). The Elevation-Dataset is loaded to the Layer-List und to the Main Map-View but not loaded to the Elevation-Profile-View and not to the Layer-List of the Elevation-Profile.

Versions

3.38.2

Supported QGIS version

• [X] I'm running a supported QGIS version according to the roadmap.

New profile

• [X] I tried with a new QGIS profile

Additional context

No response

[uclaros]

Same happens if you open the .qlr by drag and drop.

The QgsLayerTreeRegistryBridge in the profile widget relies on the QgsProject::legendLayersAdded() signal in order to be kept updated. The signal is not fired in .qlr loading code, since loadInLegend is set to false: https://github.com/qgis/QGIS/blob/5215f3351a140ef942a9ff1b64623fcaf26df683/src/core/qgslayerdefinition.cpp#L173-L183