Dart analyser need to be manually run too often

each time I'm running `flutter pub pub run build_runner build --delete-conflicting-outputs` (or whatch equivalent) the IDE doesn't get what as been updated so I need to manually run the dart analyzer for the changes to be taken into consideration. Same when I `flutter packages get` I need to run the dart analyzer for the changes to be in the IDE.

Would be nice to run dart analyzer automatically on package get (or having a checkbox on settings to enable that).
For the build_runner I don't have any solution except implementing #3137 that will allow the IDE to run dart analyzer when needed.