Support running on all connected devices

[mit-mit]

flutter_tools as of flutter/flutter@0770c3c supports a -d all option to run on all connected devices. It would be great to support something similar in IJ, for example to have an 'All connected' option in the device picker.

[eseidelGoogle]

My understanding is that the feature as-designed cannot work with Google's Flutter build setup, and so far I'm not aware of non-demo uses of this feature. :) So I suspect this is relatively low priority?

[devoncarew]

This matches my understanding - the times I have heard it brought up were all in the context of demos. Perhaps an item to test with users, in terms of their expectations and desired workflows.

[mit-mit]

I heard two developers request this feature at First Look. Not for demos, but for being able to make chances and see the effect on both platforms at the same time.

But, we can always add this later once we have more feedback.

[mit-mit]

Got another request for this from a customer at I/O. Their use case was the ability to see both Android and iOS layout at the same time.

[devoncarew]

From @Hixie:

We have received multiple reports from people at Google I/O that if -d all was available from IntelliJ itself, they would start using Flutter immediately.

[mit-mit]

@devoncarew how can this be 'high priority' but not in the current milestone?

[devoncarew]

Ah, the high priority tag was added by Ian. We can drop it if we don't agree. But I think we're already at capacity for the current milestone, and generally I think are working on the right things (#1060).

[mit-mit]

Let's target this for M16 then

[devoncarew]

In order to limit the scope for the initial implementation, one idea would be that when All is selected in the device chooser, we disable the debug button (run is still enabled).

[mit-mit]

That would be fine; it matches the use cases we have heard so far.