Android Studio 2.3.3: Does not offer import suggestions - android-studio

Windows 10, Android Studio 2.3.3
When in my project no import some classes, the Android Studio not offer import options. Also in show errors only "Messages" window. But not show red line under incorrect text. Also not work "Go to declaration".
I invalidate cache and restart but it not help.

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Flutter autocomplete stops working after launching Android emulator

I ran into a problem where Android Studio/IntelliJ Flutter/Dart autocomplete and imports suggestion stops working. Once AS is restarted the problem disappears.
Description and steps to reproduces are given below.
Steps to reproduce
Open existing Flutter project in Android Studio;
Create a new variable;
Click Alt+Enter to import the variable's class;
The Dart package is imported;
Launch Android emulator
Create another variable;
Click Alt+Enter to import the variable's class;
Expected: class is imported
Actual: No import suggestions are given. When writing the class name, no autocomplete
Software versions
Windows 10 Pro x64
Android Studio 4.1.2
Android Emulator 30.3.5 version
Flutter doctor
Flutter (Channel stable, 1.22.5, on Microsoft Windows [Version 10.0.19042.685], locale lt-LT)
System
Dell Precision 7540
I tried googling for this but haven't found similar questions. I guess this is related to what ports are used by the Dart analysis server and the Android emulator. Restarting AS 20 times per day doesn't seem like an efficient solution.
According to one of the vscode-dart developers he has created a fix for this which should be in the next major release: https://github.com/dart-lang/sdk/issues/44650
Sidenote that i've been struggling with this issue for ages as well so I'm hoping it really will be fixed 😅

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