Images are not rendered after application resumes from background #64558
Description
Steps to Reproduce
This issue only affects our iOS builds.
- Create and run an application that displays some images
- Suspend the app and leave it in background for a while (usually a matter of an hour or more)
- (Optional: not sure it is related to the issue) Have the application perform some background task
- Relaunch the app
Expected results:
The Image widgets displayed in step 1 should still be visible and fully functioning.
Actual results:
Most of all of the Image widgets that were on-screen when the app went in background are no longer displaying their image content after app resumes.
Details
- Both images downloaded via network (cached by cached_network_image) and some assets embedded in application are missing after app resumes.
- PNGs used for small icons seems to be unaffected: in the attached screenshot the dark-grey (hard to see) picture at the center of screen is the only missing non-network asset and it happens to be a JPEG (not sure if related).
- all subsequent image renderings after the app resumes are fully functional
- this application was also suffering from #55969, we suspect this might be a related regression or some remaining metal rendering issue.
Logs
Our .ipa is built in CI using Bitrise. The following log comes from the virtual machine that executes our build workflow.
+ flutter doctor -v
Downloading Material fonts... 0.5s
Downloading Gradle Wrapper... 0.1s
Downloading package sky_engine... 0.2s
Downloading flutter_patched_sdk tools... 0.9s
Downloading flutter_patched_sdk_product tools... 0.8s
Downloading darwin-x64 tools... 1.3s
Downloading libimobiledevice... 0.1s
Downloading usbmuxd... 0.1s
Downloading libplist... 0.1s
Downloading openssl... 0.2s
Downloading ios-deploy... 0.1s
Downloading darwin-x64/font-subset tools... 0.2s
Downloading android-arm-profile/darwin-x64 tools... 0.4s
Downloading android-arm-release/darwin-x64 tools... 0.2s
Downloading android-arm64-profile/darwin-x64 tools... 0.4s
Downloading android-arm64-release/darwin-x64 tools... 0.4s
Downloading android-x64-profile/darwin-x64 tools... 0.2s
Downloading android-x64-release/darwin-x64 tools... 0.2s
[✓] Flutter (Channel stable, 1.20.2, on Mac OS X 10.15.6 19G73, locale en-US)
• Flutter version 1.20.2 at /Users/vagrant/flutter-sdk/flutter
• Framework revision bbfbf1770c (12 days ago), 2020-08-13 08:33:09 -0700
• Engine revision 9d5b21729f
• Dart version 2.9.1
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
• Android SDK at /usr/local/share/android-sdk
• Platform android-30, build-tools 30.0.0
• ANDROID_HOME = /usr/local/share/android-sdk
• ANDROID_SDK_ROOT = /usr/local/share/android-sdk
• Java binary at: /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_252-b09)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.6, Build version 11E708
• CocoaPods version 1.9.1
[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
[!] Connected device
! No devices available
! Doctor found issues in 2 categories.