Account for current open image in FlutterImageView

[blasten]

Description

My previous patch didn't account for the fact that the image remains open after it's dequeued, so there's a bug in the current implementation. I updated the test to account for this case.

Related Issues

Fixes flutter/flutter#63897

Tests

Unit test

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Breaking Change

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[imReker]

Any further update?
FlutterImageView do not check it's size and call flutterRenderer.startRenderingToSurface/surfaceChanged like FlutterSurfaceView or FlutterTextureView, and this makes blank screen if use it directly to create a FlutterView.