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Exposing isCached for mobile app #6

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final manager = await _cacheManager;
final cachedObject = await manager.get(firebaseUrl.uniqueId);

return cachedObject != null;
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We also need to check whether the file exists in the device storage. So can you please add that condition here too?

bartdelange added a commit to bartdelange/firebase_cached_image_equality_check_fix that referenced this pull request May 4, 2023
Using covariant in this way disallows us to switch between image providers.
This is because DecorationImage and the like use an equals check on their image provider.

As shown in error below, which was thrown when switching between an asset image and the firebase image: 

======== Exception caught by widgets library =======================================================
The following _TypeError was thrown building Builder(dirty, dependencies: [Directionality, MediaQuery, _LocalizationsScope-[GlobalKey#61773]]):
type 'AssetImage' is not a subtype of type 'FirebaseImageProvider' of 'other'

The relevant error-causing widget was: 
  Ink Ink:file:///anon/lib/components/widget.dart:100:28
When the exception was thrown, this was the stack: 
#0      FirebaseImageProvider.== (package:firebase_cached_image/src/firebase_image_provider.dart)
#1      DecorationImage.== (package:flutter/src/painting/decoration_image.dart:196:24)
imsamgarg#2      BoxDecoration.== (package:flutter/src/painting/box_decoration.dart:329:24)
imsamgarg#3      InkDecoration.decoration= (package:flutter/src/material/ink_decoration.dart:355:15)
imsamgarg#4      _InkState._build (package:flutter/src/material/ink_decoration.dart:292:13)
imsamgarg#5      Builder.build (package:flutter/src/widgets/basic.dart:7448:48)
imsamgarg#6      StatelessElement.build (package:flutter/src/widgets/framework.dart:5038:49)
imsamgarg#7      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4968:15)
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