[Feature Request] Multi-Select

[neodescis]

Is your feature request related to a problem? Please describe.
We are currently using Mapbox Draw, and I am looking to migrate our project to Terra Draw. Our project allows a user to select multiple Mapbox Draw features on the map at once (multi-select), essentially to "OR" them together logically in order to create a geospatial data query. However, in going through the code for Terra Draw's select mode, it looks like the mode does not currently support multi-select. Is this something that is on the roadmap?

Describe your proposed idea for the solution to this problem
When in selection mode, if the user already has a feature selected, holds down the ctrl or shift key, and then clicks on another feature, that feature should also be selected. I would maybe expect the control points for features to go away when multiple features are selected, but I suppose either way would be fine.

Describe alternatives you've considered
A separate multi-select mode could be created instead, but this seems like it should be an option on the existing select mode. I don't think a user should need to know whether they want to go into multi-select or single-select/edit mode. Also, rather than holding down ctrl or shift, maybe clicking on each feature would toggle its selected state? Maybe either way could be supported.

[neodescis]

It's not pretty, but I've managed to hack something together that achieves the functionality I'm after:

https://stackblitz.com/edit/stackblitz-starters-sajprtlr?file=src%2Fapp%2Fapp.component.ts

Basically, this does the following:

• Tracks a feature being created in a draw mode and styles it differently
• Tracks its own notion of features being "selected," which is toggled for each feature when it is clicked (or gets a contextmenu event, i.e. is right-clicked), and styles "selected" features differently
• Clears the "selected" state of all features when creating a new one in any mode

Again, I realize this is not good code. However, this showcases the functionality I'm after. It's also still better than what I had to do to hack things into Mapbox Draw!