allow cross step snackbar

[tttp]

There are a bunch of cases where a notification (snackbar) are displayed on a step based on the action of the previous step

for instance:

• if double opt-in: display on share (or step after register) a "check your email to confirm"
• if action confirm: same, but different criteria
• coming back from a doi confirm link to the share step

and there are a bunch of less than optimal cases, like the share intro message assumes an action was taken previously (thank you..."), it might not always be the case

so let's set up a generic system to allow a step to set a message to display on the next step

[1v4n4]

@tttp , looks like we already have a generic solution. There is PreviousStepConfirm component, which, if added to a step, displays the pop-up.
The example #1789

Is this good enough?

[tttp]

Hi,

This is a good enough solution, but I'm looking to implement something more generic that would handle better customising a step based on external constraints:

• test mode (popup on main step, less relevant for other steps)
• thank you message (right now, mixed with the please share), doesn't work great if coming back from doi
• warning confirm action/check your inbox (right now, only on share, bit of a hack to prevent having it when coming from doi)
• warning confirm doi/check your inbox
• external Social proof (X shared)
• donation overlay + share (merged step)

basically, we need a more generic alert hub, I'm looking at that but your solution is great for now

[1v4n4]

ok, I'll merge #1789 so we immediately have something that works.

more generic alert hub

Would that again be pop-up snackbars or else?