This change allows the LegacyAnalysisServer to understand when the
plugin isolate (if there is one) is analyzing or not. There are a few
primary concepts:
* The plugin isolate (PluginServer) notifies the analysis server, when
analyzing all files in a context collection, and analyzing changed
files, that it is analyzing, and later that it isn't.
* The NotificationManager tracks whether the plugin isolate is analyzing
or not, based on the last status.
* The PluginManager tracks whether new plugins are initialized or not.
This is determined by the work done by the PluginWatcher. If no
plugins are configured, then plugins are declared to be "initialized".
Otherwise, the AnalysisServer sets their status to be "initialized"
after receiving the first status notification from the plugin isolate.
* The LegacyAnalysisServer now uses the additional "are plugins
analyzing" signal, held in NotificationManager, and the "are plugins
initializing" signal, held in PluginManager, to determine whether to
notify the client that analysis is complete.
Change-Id: Ie2b6a6048f074d7a26d7d5d07622a17c30fcab96
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/405444
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Sam Rawlins
ca31648dbb