Add an option to create menu in the QGIS browser

[jmkerloch]

Feature description

In addition to the possibility of adding a menu in the QGIS menu bar and in the "Add a layer menu", we propose to add a new location in the project's settings.

It is proposed to build the tree structure in the Browser (corresponding to the "menus" in the plugin) under a single LMFP entry:

But I suggest having one entry for each project and subfolders with groups and layer.

This should look like this:

A PR is on the way.

Additional context

This feature is similar to what the IDG plugin does: https://github.com/geo2france/idg-qgis-plugin/.

This feature request is formulated from Agences de l'Eau and ported by Oslandia.

[jmkerloch]

For better readability of PR I suggest we do this in several steps:

• always add project in QGIS browser (no option for project)
• refactor code for multiple layer add to be able to support Add all option in browser
• add option in project to define if it should be enable in browser

[jmkerloch]

We also need to discuss how we will implement merge option for QGIS browser.

[jmkerloch]

For Add all option we can't use an item in explorer because it won't be last since item are always sorted alphabetically.

I suggest we use a menu with an action.

[xcaeag]

Yes, I was wondering what you were going to propose.
A context menu for layer groups?
It's a shame to lose the order defined in the project.

And you won't need to add the ‘separator’ elements starting with ‘-’ either.

[Guts]

As part of this development, we also aim to allow project's icon that will be used in the QGIS browser tree, similar to what the IDG plugin does.

There are two options:

• Using a project variable lmfp_icon:

  

• The approach used by the IDG plugin, with a link named icon of type HTTPS in the project metadata/links:

  

The first one seems "better" to me since it does not interfere with project's metadata, while the second allows using a project designed for the IDG plugin.

I propose supporting both methods.

[Guts]

We should also support project's metadata/hyperlinks as IDG plugin does to ensure a similar behavior:

[Guts]

Implemented in #129