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On a CustomScrollView, the second sliver disapears visually when having a SliverPadding without child sliver as first element of the slivers array #64506

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#106071
Closed
On a CustomScrollView, the second sliver disapears visually when having a SliverPadding without child sliver as first element of the slivers array#64506
#106071
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Labels
P1High-priority issues at the top of the work listcustomer: money (g3)f: material designflutter/packages/flutter/material repository.f: scrollingViewports, list views, slivers, etc.found in release: 1.22Found to occur in 1.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer versionwaiting for PR to land (fixed)A fix is in flight
@andresemartinez

Description

@andresemartinez
andresemartinez
opened on Aug 24, 2020

Steps to Reproduce

  1. Run flutter create bug.
  2. Update the files as follows:
    main.dart
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        title: 'Bug',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: SomeWidget(),
      );
}

class SomeWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(
          title: Text('Some title'),
        ),
        body: CustomScrollView(
          slivers: [

            // This padding breaks the next sliver when scrolling
            SliverPadding(
              padding: const EdgeInsets.only(top: 24),
            ),

            // This sliver breaks while scrolling when it touches the app bar
            SliverPadding(
              padding: const EdgeInsets.symmetric(horizontal: 20),
              sliver: SliverToBoxAdapter(
                child: Text('Some Text'),
              ),
            ),

            // The same happens with other widgets
//            SliverPadding(
//              padding: const EdgeInsets.symmetric(horizontal: 20),
//              sliver: SliverToBoxAdapter(
//                child: Container(
//                  height: 50,
//                  width: 50,
//                  color: Colors.red,
//                ),
//              ),
//            ),

            // Some big padding to be able to scroll
            SliverPadding(
              padding: const EdgeInsets.only(top: 1000),
            )
          ],
        ),
      );
}
  1. Scroll the page until the 'Some text' touches the AppBar

Expected results:
The 'Some text' should be visible until its completely behind the AppBar.

Actual results:
The 'Some text' desapears visually when it touches the AppBar.

Removing the first SliverPadding makes it work as intended.

Logs 
[ +254 ms] executing: [/home/andres/lib/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +62 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] bbfbf1770cca2da7c82e887e4e4af910034800b6
[        ] executing: [/home/andres/lib/flutter/] git tag --contains HEAD
[ +401 ms] Exit code 0 from: git tag --contains HEAD
[        ] 1.20.2
[   +9 ms] executing: [/home/andres/lib/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[   +3 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/stable
[        ] executing: [/home/andres/lib/flutter/] git ls-remote --get-url origin
[   +2 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +61 ms] executing: [/home/andres/lib/flutter/] git rev-parse --abbrev-ref HEAD
[   +3 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] stable
[  +84 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +3 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +23 ms] executing: /home/andres/Android/Sdk/platform-tools/adb devices -l
[  +54 ms] List of devices attached
           emulator-5554          device product:sdk_gphone_x86 model:Android_SDK_built_for_x86 device:generic_x86 transport_id:1
[  +10 ms] /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell getprop
[  +28 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +8 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +231 ms] Generating /home/andres/dev/bug/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[  +29 ms] ro.hardware = ranchu
[  +88 ms] Starting incremental build...
[   +2 ms] Initializing file store
[  +13 ms] Skipping target: gen_localizations
[   +6 ms] complete
[  +13 ms] /home/andres/lib/flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev /home/andres/lib/flutter/bin/cache/artifacts/engine/linux-x64/frontend_server.dart.snapshot --sdk-root /home/andres/lib/flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --incremental --target=flutter --debugger-module-names -Ddart.developer.causal_async_stacks=true -Dflutter.inspector.structuredErrors=true --output-dill /tmp/flutter_tools.SQFROE/flutter_tool.HWHWWQ/app.dill --packages .packages -Ddart.vm.profile=false -Ddart.vm.product=false --bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoid-closure-call-instructions --enable-asserts --track-widget-creation --initialize-from-dill build/f872507f30e2ff2523f0f1d19160266e.cache.dill.track.dill
[  +14 ms] executing: /home/andres/Android/Sdk/build-tools/29.0.2/aapt dump xmltree /home/andres/dev/bug/build/app/outputs/flutter-apk/app.apk AndroidManifest.xml
Launching lib/main.dart on Android SDK built for x86 in debug mode...
[  +18 ms] Exit code 0 from: /home/andres/Android/Sdk/build-tools/29.0.2/aapt dump xmltree /home/andres/dev/bug/build/app/outputs/flutter-apk/app.apk AndroidManifest.xml
[        ] N: android=http://schemas.android.com/apk/res/android
             E: manifest (line=2)
               A: android:versionCode(0x0101021b)=(type 0x10)0x1
               A: android:versionName(0x0101021c)="1.0.0" (Raw: "1.0.0")
               A: android:compileSdkVersion(0x01010572)=(type 0x10)0x1c
               A: android:compileSdkVersionCodename(0x01010573)="9" (Raw: "9")
               A: package="com.example.bug" (Raw: "com.example.bug")
               A: platformBuildVersionCode=(type 0x10)0x1c
               A: platformBuildVersionName=(type 0x10)0x9
               E: uses-sdk (line=7)
                 A: android:minSdkVersion(0x0101020c)=(type 0x10)0x10
                 A: android:targetSdkVersion(0x01010270)=(type 0x10)0x1c
               E: uses-permission (line=14)
                 A: android:name(0x01010003)="android.permission.INTERNET" (Raw: "android.permission.INTERNET")
               E: application (line=22)
                 A: android:label(0x01010001)="bug" (Raw: "bug")
                 A: android:icon(0x01010002)=@0x7f080000
                 A: android:name(0x01010003)="io.flutter.app.FlutterApplication" (Raw: "io.flutter.app.FlutterApplication")
                 A: android:debuggable(0x0101000f)=(type 0x12)0xffffffff
                 A: android:appComponentFactory(0x0101057a)="androidx.core.app.CoreComponentFactory" (Raw: "androidx.core.app.CoreComponentFactory")
                 E: activity (line=28)
                   A: android:theme(0x01010000)=@0x7f0a0000
                   A: android:name(0x01010003)="com.example.bug.MainActivity" (Raw: "com.example.bug.MainActivity")
                   A: android:launchMode(0x0101001d)=(type 0x10)0x1
                   A: android:configChanges(0x0101001f)=(type 0x11)0x40003fb4
                   A: android:windowSoftInputMode(0x0101022b)=(type 0x11)0x10
                   A: android:hardwareAccelerated(0x010102d3)=(type 0x12)0xffffffff
                   E: intent-filter (line=35)
                     E: action (line=36)
                       A: android:name(0x01010003)="android.intent.action.MAIN" (Raw: "android.intent.action.MAIN")
                     E: category (line=38)
                       A: android:name(0x01010003)="android.intent.category.LAUNCHER" (Raw: "android.intent.category.LAUNCHER")
                 E: meta-data (line=45)
                   A: android:name(0x01010003)="flutterEmbedding" (Raw: "flutterEmbedding")
                   A: android:value(0x01010024)=(type 0x10)0x2
[  +10 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell -x logcat -v time -t 1
[  +50 ms] Exit code 0 from: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell -x logcat -v time -t 1
[        ] --------- beginning of main
           08-24 17:24:16.437 E/GnssHAL_GnssInterface( 1749): gnssSvStatusCb: b: input svInfo.flags is 8
[   +1 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell -x logcat -v time -t 1
[  +18 ms] Exit code 0 from: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell -x logcat -v time -t 1
[        ] --------- beginning of main
           08-24 17:24:16.437 E/GnssHAL_GnssInterface( 1749): gnssSvStatusCb: b: input svInfo.flags is 8
[  +13 ms] <- compile package:bug/main.dart
[  +11 ms] executing: /home/andres/Android/Sdk/platform-tools/adb version
[  +23 ms] Android Debug Bridge version 1.0.41
           Version 30.0.4-6686687
           Installed as /home/andres/Android/Sdk/platform-tools/adb
[   +3 ms] executing: /home/andres/Android/Sdk/platform-tools/adb start-server
[   +4 ms] Building APK
Running Gradle task 'assembleDebug'...
[  +31 ms] gradle.properties already sets `android.enableR8`
[   +3 ms] Using gradle from /home/andres/dev/bug/android/gradlew.
[   +1 ms] /home/andres/dev/bug/android/gradlew mode: 33261 rwxr-xr-x.
[  +26 ms] executing: /home/andres/bin/android-studio/jre/bin/java -version
[ +142 ms] Exit code 0 from: /home/andres/bin/android-studio/jre/bin/java -version
[        ] openjdk version "1.8.0_202-release"
           OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
           OpenJDK 64-Bit Server VM (build 25.202-b49-5587405, mixed mode)
[   +6 ms] executing: [/home/andres/dev/bug/android/] /home/andres/dev/bug/android/gradlew -q -Ptarget-platform=android-x86 -Ptarget=/home/andres/dev/bug/lib/main.dart -Ptrack-widget-creation=true -Pfilesystem-scheme=org-dartlang-root -Pdart-defines=flutter.inspector.structuredErrors%3Dtrue assembleDebug
[+18163 ms] calculateSha: LocalDirectory: '/home/andres/dev/bug/build/app/outputs/flutter-apk'/app.apk
[  +48 ms] calculateSha: reading file took 47us
[ +611 ms] calculateSha: computing sha took 610us
✓ Built build/app/outputs/flutter-apk/app-debug.apk.
[  +11 ms] executing: /home/andres/Android/Sdk/build-tools/29.0.2/aapt dump xmltree /home/andres/dev/bug/build/app/outputs/flutter-apk/app.apk AndroidManifest.xml
[ +147 ms] Exit code 0 from: /home/andres/Android/Sdk/build-tools/29.0.2/aapt dump xmltree /home/andres/dev/bug/build/app/outputs/flutter-apk/app.apk AndroidManifest.xml
[        ] N: android=http://schemas.android.com/apk/res/android
             E: manifest (line=2)
               A: android:versionCode(0x0101021b)=(type 0x10)0x1
               A: android:versionName(0x0101021c)="1.0.0" (Raw: "1.0.0")
               A: android:compileSdkVersion(0x01010572)=(type 0x10)0x1c
               A: android:compileSdkVersionCodename(0x01010573)="9" (Raw: "9")
               A: package="com.example.bug" (Raw: "com.example.bug")
               A: platformBuildVersionCode=(type 0x10)0x1c
               A: platformBuildVersionName=(type 0x10)0x9
               E: uses-sdk (line=7)
                 A: android:minSdkVersion(0x0101020c)=(type 0x10)0x10
                 A: android:targetSdkVersion(0x01010270)=(type 0x10)0x1c
               E: uses-permission (line=14)
                 A: android:name(0x01010003)="android.permission.INTERNET" (Raw: "android.permission.INTERNET")
               E: application (line=22)
                 A: android:label(0x01010001)="bug" (Raw: "bug")
                 A: android:icon(0x01010002)=@0x7f080000
                 A: android:name(0x01010003)="io.flutter.app.FlutterApplication" (Raw: "io.flutter.app.FlutterApplication")
                 A: android:debuggable(0x0101000f)=(type 0x12)0xffffffff
                 A: android:appComponentFactory(0x0101057a)="androidx.core.app.CoreComponentFactory" (Raw: "androidx.core.app.CoreComponentFactory")
                 E: activity (line=28)
                   A: android:theme(0x01010000)=@0x7f0a0000
                   A: android:name(0x01010003)="com.example.bug.MainActivity" (Raw: "com.example.bug.MainActivity")
                   A: android:launchMode(0x0101001d)=(type 0x10)0x1
                   A: android:configChanges(0x0101001f)=(type 0x11)0x40003fb4
                   A: android:windowSoftInputMode(0x0101022b)=(type 0x11)0x10
                   A: android:hardwareAccelerated(0x010102d3)=(type 0x12)0xffffffff
                   E: intent-filter (line=35)
                     E: action (line=36)
                       A: android:name(0x01010003)="android.intent.action.MAIN" (Raw: "android.intent.action.MAIN")
                     E: category (line=38)
                       A: android:name(0x01010003)="android.intent.category.LAUNCHER" (Raw: "android.intent.category.LAUNCHER")
                 E: meta-data (line=45)
                   A: android:name(0x01010003)="flutterEmbedding" (Raw: "flutterEmbedding")
                   A: android:value(0x01010024)=(type 0x10)0x2
[   +1 ms] Stopping app 'app.apk' on Android SDK built for x86.
[   +2 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell am force-stop com.example.bug
[ +669 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell pm list packages com.example.bug
[ +382 ms] package:com.example.bug
[   +3 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell cat /data/local/tmp/sky.com.example.bug.sha1
[  +32 ms] 05765e010765823bee4595d227323623dd9f8642
[        ] Installing APK.
[   +2 ms] executing: /home/andres/Android/Sdk/platform-tools/adb version
[   +9 ms] Android Debug Bridge version 1.0.41
           Version 30.0.4-6686687
           Installed as /home/andres/Android/Sdk/platform-tools/adb
[        ] executing: /home/andres/Android/Sdk/platform-tools/adb start-server
[   +6 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 install -t -r /home/andres/dev/bug/build/app/outputs/flutter-apk/app.apk
Installing build/app/outputs/flutter-apk/app.apk...
[+2298 ms] Performing Streamed Install
           Success
[   +1 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell echo -n 3d6c13a827b758b7720717034294bb9a5b265971 > /data/local/tmp/sky.com.example.bug.sha1
[ +981 ms] Android SDK built for x86 startApp
[   +8 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 shell am start -a android.intent.action.RUN -f 0x20000000 --ez enable-background-compilation true --ez enable-dart-profiling true --ez enable-checked-mode true --ez verify-entry-points true --ez start-paused true com.example.bug/com.example.bug.MainActivity
[ +419 ms] Starting: Intent { act=android.intent.action.RUN flg=0x20000000 cmp=com.example.bug/.MainActivity (has extras) }
[        ] Waiting for observatory port to be available...
[+9592 ms] Observatory URL on device: http://127.0.0.1:39243/SlWONuUSkFI=/
[   +6 ms] executing: /home/andres/Android/Sdk/platform-tools/adb -s emulator-5554 forward tcp:0 tcp:39243
[  +17 ms] 42951
[        ] Forwarded host port 42951 to device port 39243 for Observatory
[  +23 ms] Caching compiled dill
[ +194 ms] Connecting to service protocol: http://127.0.0.1:42951/SlWONuUSkFI=/
[+1764 ms] Successfully connected to service protocol: http://127.0.0.1:42951/SlWONuUSkFI=/
Waiting for Android SDK built for x86 to report its views...
[  +33 ms] DevFS: Creating new filesystem on the device (null)
[  +31 ms] DevFS: Created new filesystem on the device (file:///data/user/0/com.example.bug/code_cache/bugTMHGDW/bug/)
[   +2 ms] Updating assets
Debug service listening on ws://127.0.0.1:42951/SlWONuUSkFI=/ws
Syncing files to device Android SDK built for x86...
[ +102 ms] Scanning asset files
[   +2 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[        ] <- recompile package:bug/main.dart acd92c52-3c82-4724-995d-a65d5d51e9fd
[        ] <- acd92c52-3c82-4724-995d-a65d5d51e9fd
[  +86 ms] Updating files
[ +341 ms] DevFS: Sync finished
[   +1 ms] Synced 0.9MB.
[   +1 ms] <- accept
[   +6 ms] Connected to _flutterView/0xdbc8cc10.
D/EGL_emulation(18379): eglMakeCurrent: 0xdf01a120: ver 2 0 (tinfo 0xdf00f000)
D/eglCodecCommon(18379): setVertexArrayObject: set vao to 0 (0) 1 0
I/OpenGLRenderer(18379): Davey! duration=2965ms; Flags=1, IntendedVsync=49215591146977, Vsync=49215591146977, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=49215598214472, AnimationStart=49215598240932, PerformTraversalsStart=49215598243598, DrawStart=49218439484249, SyncQueued=49218443655797, SyncStart=49218459180809, IssueDrawCommandsStart=49218488721172, SwapBuffers=49218526219109, FrameCompleted=49218572173947, DequeueBufferDuration=28195000, QueueBufferDuration=324000, 
I/Choreographer(18379): Skipped 179 frames!  The application may be doing too much work on its main thread.
D/EGL_emulation(18379): eglMakeCurrent: 0xf227eaa0: ver 2 0 (tinfo 0xdbc55940)
D/eglCodecCommon(18379): setVertexArrayObject: set vao to 0 (0) 1 0

~/dev/bug ➜ flutter analyze                                                                                                                                                                        [17:30:29]
Analyzing bug...                                                        
No issues found! (ran in 4.6s)

~/dev/bug ➜ flutter doctor -v                                                                                                                                                                      [17:31:23]
[✓] Flutter (Channel stable, 1.20.2, on Linux, locale en_US.UTF-8)
    • Flutter version 1.20.2 at /home/andres/lib/flutter
    • Framework revision bbfbf1770c (11 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 29.0.2)
    • Android SDK at /home/andres/Android/Sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /home/andres/bin/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    ✗ Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions.

[!] Android Studio (version 3.5)
    • Android Studio at /home/andres/bin/android-studio
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] IntelliJ IDEA Ultimate Edition (version 2019.3)
    • IntelliJ at /home/andres/bin/idea-IU-193.6015.39
    • Flutter plugin version 45.1.2
    • Dart plugin version 193.6911.31

[✓] Connected device (1 available)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

! Doctor found issues in 2 categories.

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P1High-priority issues at the top of the work listcustomer: money (g3)f: material designflutter/packages/flutter/material repository.f: scrollingViewports, list views, slivers, etc.found in release: 1.22Found to occur in 1.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer versionwaiting for PR to land (fixed)A fix is in flight

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