angular_analyzer_plugin doesn't work until you clear Dart Analysis Server cache (.dartServer folder)

[alexander-doroshko]

IntelliJ IDEA 2019.1.3 or later + corresponding Dart plugin. Dart SDK 2.3.1.
Steps to reproduce:

• Create a new Dart project (chose AngularDart Web App template). 'Pub get' done automatically. No analysis errors.
• Enable angular plugin in the analysis_options.yaml file, restart Analysis Server (or reopen project)

analyzer:
  ...
  plugins:
    - angular

• Observe that there's a lot of yellow code in HTML templates, AngularDart-specific navigation and completion doesn't work.
  

• Clear Analysis Server caches (i.e. delete .dartServer folder, on Windows it's in C:\Users\user_name\AppData\Local\.dartServer)

• Reopen project, wait a minute after analysis is complete

• Now the angular_analyzer_plugin works. Navigation, completion, etc.