[Home screen] "+" fab only shown when zoomed in

[gino-m]

The "+" is not shown when zoomed out.

This is likely a relic of the old card behavior when cards were only shown when zoomed in.

@andreia-ferreira @hassan-nsubuga

[andreia-ferreira]

Taking a look at the code it does seem intentional to hide the button when zoomed below a set threshold (CLUSTERING_ZOOM_THRESHOLD = 14f) that determines that clusters should show instead of individual LOIs and the '+' button should be hidden.

Does it make sense to allow adding LOIs when you're zoomed out that far? Placing a new site might not be very precise in that case

[gino-m]

This was previously implemented because the action of adding a new site used to be immediate; the site would be added wherever the map happened to be. Hiding the "+" fab was at the cost of discoverability; the user needed to know to zoom in to start the flow. Since the site is no longer added immediately on tap, we no longer need to make the trade-off. If we're concerned about the user adding a site while zoomed out, we now can address it on the "add site" task instead.