we need to make it more clear when people's tools are out of date

[devoncarew]

Specifically, the Flutter IntelliJ plugin (and perhaps the flutter runtime?).

One idea for this is to do an update check ourselves, and open a modal dialog (ala Android Studio).

[devoncarew]

/cc @wmleler, who ran into this recently

[helin24]

I think this is accomplished with #8235