No output if any params used in Positioned - Rare case #120698 - flutter

Question

Steps to Reproduce
Create a Flutter project.
Make a list of containers.
run .map() function on it which returns Positioned() widget.
Use a list of these positioned widgets inside a Stack.
If you use paraments like top, left etc., no output will be given.
If these are ignored, it works like a charm.
Execute flutter run on the code sample
Expected results:
After removing top parameter. Even just using top: 25 gives no output.
Actual results:
Code sample
import "package:flutter/material.dart";
class StackedList extends StatefulWidget {
const StackedList({
required this.children,
this.activeItemCount = 3,
super.key,
});
//List containing all the widgets to be showed as part of stacked UI
final List<Widget> children;
//number of items shown
final int activeItemCount;
#override
State<StackedList> createState() => _StackedListState();
}
class _StackedListState extends State<StackedList> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Stack(
children:
widget.children.map((element) {
final index = widget.children.indexOf(element);
return Positioned(
top: 200 + (index * 10),
child: Transform.scale(
scale: 1 - (index / 20),
child: element,
),
);
}).toList()
),
));
}
}
final childrens = <Widget>[
Container(
height: 75,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(16),
color: Colors.green,
),
),
Container(
height: 75,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(16),
color: Colors.greenAccent,
),
),
Container(
height: 75,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(16),
color: Colors.grey,
),
),
Container(
height: 75,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(16),
color: Colors.brown,
),
)
],
Logs
No error logs
[ ] Transforming lifecycle-runtime-2.2.0.aar (androidx.lifecycle:lifecycle-runtime:2.2.0) with
ExtractAarTransform
[ ] Transforming lifecycle-runtime-2.2.0.aar (androidx.lifecycle:lifecycle-runtime:2.2.0) with AarTransform
[ ] Transforming lifecycle-runtime-2.2.0.aar (androidx.lifecycle:lifecycle-runtime:2.2.0) with JetifyTransform
[ ] Transforming lifecycle-runtime-2.2.0.aar (androidx.lifecycle:lifecycle-runtime:2.2.0) with
ExtractAarTransform
[ ] Transforming lifecycle-runtime-2.2.0.aar (androidx.lifecycle:lifecycle-runtime:2.2.0) with AarTransform
[ ] Transforming savedstate-1.0.0.aar (androidx.savedstate:savedstate:1.0.0) with JetifyTransform
[ ] Transforming savedstate-1.0.0.aar (androidx.savedstate:savedstate:1.0.0) with ExtractAarTransform
[ ] Transforming savedstate-1.0.0.aar (androidx.savedstate:savedstate:1.0.0) with AarTransform
[ ] Transforming lifecycle-livedata-2.0.0.aar (androidx.lifecycle:lifecycle-livedata:2.0.0) with
JetifyTransform
[ ] Transforming lifecycle-livedata-2.0.0.aar (androidx.lifecycle:lifecycle-livedata:2.0.0) with
ExtractAarTransform
[ ] Transforming lifecycle-livedata-2.0.0.aar (androidx.lifecycle:lifecycle-livedata:2.0.0) with AarTransform
[ ] Transforming lifecycle-livedata-core-2.0.0.aar (androidx.lifecycle:lifecycle-livedata-core:2.0.0) with
JetifyTransform
[ ] Transforming lifecycle-livedata-core-2.0.0.aar (androidx.lifecycle:lifecycle-livedata-core:2.0.0) with
ExtractAarTransform
[ ] Transforming lifecycle-livedata-core-2.0.0.aar (androidx.lifecycle:lifecycle-livedata-core:2.0.0) with
AarTransform
[ ] Transforming lifecycle-common-2.2.0.jar (androidx.lifecycle:lifecycle-common:2.2.0) with JetifyTransform
[ ] Transforming lifecycle-common-2.2.0.jar (androidx.lifecycle:lifecycle-common:2.2.0) with
ExtractJniTransform
[ ] Transforming tracing-1.0.0.aar (androidx.tracing:tracing:1.0.0) with JetifyTransform
[ ] Transforming tracing-1.0.0.aar (androidx.tracing:tracing:1.0.0) with ExtractAarTransform
[ ] Transforming tracing-1.0.0.aar (androidx.tracing:tracing:1.0.0) with AarTransform
[ ] Transforming core-runtime-2.0.0.aar (androidx.arch.core:core-runtime:2.0.0) with JetifyTransform
[ ] Transforming core-runtime-2.0.0.aar (androidx.arch.core:core-runtime:2.0.0) with ExtractAarTransform
[ ] Transforming core-runtime-2.0.0.aar (androidx.arch.core:core-runtime:2.0.0) with AarTransform
[ ] Transforming core-common-2.1.0.jar (androidx.arch.core:core-common:2.1.0) with JetifyTransform
[ ] Transforming core-common-2.1.0.jar (androidx.arch.core:core-common:2.1.0) with ExtractJniTransform
[ ] Transforming versionedparcelable-1.1.1.aar (androidx.versionedparcelable:versionedparcelable:1.1.1) with
JetifyTransform
[ ] Transforming versionedparcelable-1.1.1.aar (androidx.versionedparcelable:versionedparcelable:1.1.1) with
ExtractAarTransform
[ ] Transforming versionedparcelable-1.1.1.aar (androidx.versionedparcelable:versionedparcelable:1.1.1) with
AarTransform
[ ] Transforming collection-1.1.0.jar (androidx.collection:collection:1.1.0) with JetifyTransform
[ ] Transforming collection-1.1.0.jar (androidx.collection:collection:1.1.0) with ExtractJniTransform
[ ] Transforming lifecycle-viewmodel-2.1.0.aar (androidx.lifecycle:lifecycle-viewmodel:2.1.0) with
JetifyTransform
[ ] Transforming lifecycle-viewmodel-2.1.0.aar (androidx.lifecycle:lifecycle-viewmodel:2.1.0) with
ExtractAarTransform
[ ] Transforming lifecycle-viewmodel-2.1.0.aar (androidx.lifecycle:lifecycle-viewmodel:2.1.0) with AarTransform[ ] Transforming annotation-1.2.0.jar (androidx.annotation:annotation:1.2.0) with JetifyTransform
[ ] Transforming annotation-1.2.0.jar (androidx.annotation:annotation:1.2.0) with ExtractJniTransform
[ ] Transforming kotlin-stdlib-1.7.10.jar (org.jetbrains.kotlin:kotlin-stdlib:1.7.10) with JetifyTransform
[ ] Transforming kotlin-stdlib-1.7.10.jar (org.jetbrains.kotlin:kotlin-stdlib:1.7.10) with ExtractJniTransform
[ ] Transforming annotation-experimental-1.1.0.aar (androidx.annotation:annotation-experimental:1.1.0) with
JetifyTransform
[ ] Transforming annotation-experimental-1.1.0.aar (androidx.annotation:annotation-experimental:1.1.0) with
ExtractAarTransform
[ ] Transforming annotation-experimental-1.1.0.aar (androidx.annotation:annotation-experimental:1.1.0) with
AarTransform
[ ] Transforming kotlin-stdlib-common-1.7.10.jar (org.jetbrains.kotlin:kotlin-stdlib-common:1.7.10) with
JetifyTransform
[ ] Transforming kotlin-stdlib-common-1.7.10.jar (org.jetbrains.kotlin:kotlin-stdlib-common:1.7.10) with
ExtractJniTransform
[ ] Transforming annotations-13.0.jar (org.jetbrains:annotations:13.0) with JetifyTransform
[ ] Transforming annotations-13.0.jar (org.jetbrains:annotations:13.0) with ExtractJniTransform
[ ] Caching disabled for task ':app:mergeDebugNativeLibs' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:mergeDebugNativeLibs' as it is up-to-date.
[ ] :app:mergeDebugNativeLibs (Thread[Execution worker Thread 4,5,main]) completed. Took 0.007 secs.
[ ] Resolve mutations for :app:stripDebugDebugSymbols (Thread[Execution worker Thread 5,5,main]) started.
[ ] Resolve mutations for :app:stripDebugDebugSymbols (Thread[Execution worker Thread 5,5,main]) completed.
Took 0.0 secs.
[ ] :app:stripDebugDebugSymbols (Thread[Execution worker Thread 4,5,main]) started.
[ ] > Task :app:stripDebugDebugSymbols UP-TO-DATE
[ ] Caching disabled for task ':app:stripDebugDebugSymbols' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:stripDebugDebugSymbols' as it is up-to-date.
[ ] :app:stripDebugDebugSymbols (Thread[Execution worker Thread 4,5,main]) completed. Took 0.001 secs.
[ ] Resolve mutations for :app:validateSigningDebug (Thread[Execution worker Thread 5,5,main]) started.
[ ] Resolve mutations for :app:validateSigningDebug (Thread[Execution worker Thread 5,5,main]) completed. Took
0.0 secs.
[ ] :app:validateSigningDebug (Thread[Execution worker Thread 5,5,main]) started.
[ ] > Task :app:validateSigningDebug UP-TO-DATE
[ ] Caching disabled for task ':app:validateSigningDebug' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:validateSigningDebug' as it is up-to-date.
[ ] :app:validateSigningDebug (Thread[Execution worker Thread 5,5,main]) completed. Took 0.0 secs.
[ ] Resolve mutations for :app:writeDebugAppMetadata (Thread[Execution worker Thread 4,5,main]) started.
[ ] Resolve mutations for :app:writeDebugAppMetadata (Thread[Execution worker Thread 4,5,main]) completed. Took0.0 secs.
[ ] :app:writeDebugAppMetadata (Thread[Execution worker Thread 4,5,main]) started.
[ ] > Task :app:writeDebugAppMetadata UP-TO-DATE
[ ] Caching disabled for task ':app:writeDebugAppMetadata' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:writeDebugAppMetadata' as it is up-to-date.
[ ] Resolve mutations for :app:writeDebugSigningConfigVersions (Thread[Execution worker Thread 5,5,main])
started.
[ ] Resolve mutations for :app:writeDebugSigningConfigVersions (Thread[Execution worker Thread 5,5,main])
completed. Took 0.0 secs.
[ ] :app:writeDebugAppMetadata (Thread[Execution worker Thread 4,5,main]) completed. Took 0.001 secs.
[ ] :app:writeDebugSigningConfigVersions (Thread[Execution worker Thread 5,5,main]) started.
[ ] > Task :app:writeDebugSigningConfigVersions UP-TO-DATE
[ ] Caching disabled for task ':app:writeDebugSigningConfigVersions' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:writeDebugSigningConfigVersions' as it is up-to-date.
[ ] :app:writeDebugSigningConfigVersions (Thread[Execution worker Thread 5,5,main]) completed. Took 0.002 secs.[ ] > Task :app:compressDebugAssets
[ ] Execution optimizations have been disabled for task ':app:compressDebugAssets' to ensure correctness due tothe following reasons:
[ ] - Gradle detected a problem with the following location: 'C:\Code
Projects\amazon_echo_page\build\app\intermediates\assets\debug\mergeDebugAssets'. Reason: Task
':app:compressDebugAssets' uses this output of task ':app:copyFlutterAssetsDebug' without declaring an explicit or
implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are
executed. Please refer to https://docs.gradle.org/7.5/userguide/validation_problems.html#implicit_dependency for more
details about this problem.
[ ] Invalidating VFS because task ':app:compressDebugAssets' failed validation
[ ] Not watching anything anymore
[ ] Watching 0 directory hierarchies to track changes
[ ] Caching disabled for task ':app:compressDebugAssets' because:
[ ] Build cache is disabled
[ ] Task ':app:compressDebugAssets' is not up-to-date because:
[ ] Incremental execution has been disabled to ensure correctness. Please consult deprecation warnings for
more details.
[ ] The input changes require a full rebuild for incremental task ':app:compressDebugAssets'.
[ ] :app:compressDebugAssets (Thread[Execution worker Thread 6,5,main]) completed. Took 0.681 secs.
[ ] Resolve mutations for :app:packageDebug (Thread[Execution worker Thread 5,5,main]) started.
[ +23 ms] Resolve mutations for :app:packageDebug (Thread[Execution worker Thread 5,5,main]) completed. Took 0.0
secs.
[ ] :app:packageDebug (Thread[Execution worker Thread 6,5,main]) started.
[ ] > Task :app:packageDebug UP-TO-DATE
[ ] Caching disabled for task ':app:packageDebug' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:packageDebug' as it is up-to-date.
[ ] :app:packageDebug (Thread[Execution worker Thread 6,5,main]) completed. Took 0.007 secs.
[ ] Resolve mutations for :app:createDebugApkListingFileRedirect (Thread[Execution worker Thread 6,5,main])
started.
[ ] Resolve mutations for :app:createDebugApkListingFileRedirect (Thread[Execution worker Thread 6,5,main])
completed. Took 0.0 secs.
[ ] :app:createDebugApkListingFileRedirect (Thread[Execution worker Thread 6,5,main]) started.
[ ] producer locations for task group 0 (Thread[Execution worker,5,main]) started.
[ ] producer locations for task group 0 (Thread[Execution worker,5,main]) completed. Took 0.0 secs.
[ ] > Task :app:createDebugApkListingFileRedirect UP-TO-DATE
[ ] Caching disabled for task ':app:createDebugApkListingFileRedirect' because:
[ ] Build cache is disabled
[ ] Skipping task ':app:createDebugApkListingFileRedirect' as it is up-to-date.
[ ] :app:createDebugApkListingFileRedirect (Thread[Execution worker Thread 6,5,main]) completed. Took 0.001
secs.
[ ] Resolve mutations for :app:assembleDebug (Thread[Execution worker Thread 6,5,main]) started.
[ ] Resolve mutations for :app:assembleDebug (Thread[Execution worker Thread 6,5,main]) completed. Took 0.0
secs.
[ ] :app:assembleDebug (Thread[Execution worker Thread 6,5,main]) started.
[ +25 ms] > Task :app:assembleDebug
[ ] Caching disabled for task ':app:assembleDebug' because:
[ ] Build cache is disabled
[ ] Task ':app:assembleDebug' is not up-to-date because:
[ ] Task has not declared any outputs despite executing actions.
[ ] :app:assembleDebug (Thread[Execution worker Thread 6,5,main]) completed. Took 0.104 secs.
[ ] Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.
[ ] You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come
from your own scripts or plugins.
[ ] See https://docs.gradle.org/7.5/userguide/command_line_interface.html#sec:command_line_warnings
[ ] Execution optimizations have been disabled for 1 invalid unit(s) of work during this build to ensure
correctness.
[ ] Please consult deprecation warnings for more details.
[ ] BUILD SUCCESSFUL in 5s
[ ] 36 actionable tasks: 6 executed, 30 up-to-date
[ ] Watched directory hierarchies: []
[ +529 ms] Running Gradle task 'assembleDebug'... (completed in 6.5s)
[ +2 ms] Calculate SHA1: LocalDirectory: 'C:\Code
Projects\amazon_echo_page\build\app\outputs\flutter-apk'/app-debug.apk
[ +597 ms] √ Built build\app\outputs\flutter-apk\app-debug.apk.
[ +2 ms] executing: C:\src\Android\SDK\build-tools\33.0.1\aapt dump xmltree C:\Code
Projects\amazon_echo_page\build\app\outputs\flutter-apk\app-debug.apk AndroidManifest.xml
[ +24 ms] Exit code 0 from: C:\src\Android\SDK\build-tools\33.0.1\aapt dump xmltree C:\Code
Projects\amazon_echo_page\build\app\outputs\flutter-apk\app-debug.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)0x21
A: android:compileSdkVersionCodename(0x01010573)="13" (Raw: "13")
A: package="com.example.amazon_echo_page" (Raw: "com.example.amazon_echo_page")
A: platformBuildVersionCode=(type 0x10)0x21
A: platformBuildVersionName=(type 0x10)0xd
E: uses-sdk (line=7)
A: android:minSdkVersion(0x0101020c)=(type 0x10)0x10
A: android:targetSdkVersion(0x01010270)=(type 0x10)0x21
E: uses-permission (line=15)
A: android:name(0x01010003)="android.permission.INTERNET" (Raw: "android.permission.INTERNET")
E: application (line=17)
A: android:label(0x01010001)="amazon_echo_page" (Raw: "amazon_echo_page")
A: android:icon(0x01010002)=#0x7f080000
A: android:name(0x01010003)="android.app.Application" (Raw: "android.app.Application")
A: android:debuggable(0x0101000f)=(type 0x12)0xffffffff
A: android:appComponentFactory(0x0101057a)="androidx.core.app.CoreComponentFactory" (Raw:
"androidx.core.app.CoreComponentFactory")
E: activity (line=23)
A: android:theme(0x01010000)=#0x7f0a0000
A: android:name(0x01010003)="com.example.amazon_echo_page.MainActivity" (Raw:
"com.example.amazon_echo_page.MainActivity")
A: android:exported(0x01010010)=(type 0x12)0xffffffff
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: meta-data (line=38)
A: android:name(0x01010003)="io.flutter.embedding.android.NormalTheme" (Raw:
"io.flutter.embedding.android.NormalTheme")
A: android:resource(0x01010025)=#0x7f0a0001
E: intent-filter (line=42)
E: action (line=43)
A: android:name(0x01010003)="android.intent.action.MAIN" (Raw: "android.intent.action.MAIN")
E: category (line=45)
A: android:name(0x01010003)="android.intent.category.LAUNCHER" (Raw:
"android.intent.category.LAUNCHER")
E: meta-data (line=52)
A: android:name(0x01010003)="flutterEmbedding" (Raw: "flutterEmbedding")
A: android:value(0x01010024)=(type 0x10)0x2
E: uses-library (line=56)
A: android:name(0x01010003)="androidx.window.extensions" (Raw: "androidx.window.extensions")
A: android:required(0x0101028e)=(type 0x12)0x0
E: uses-library (line=59)
A: android:name(0x01010003)="androidx.window.sidecar" (Raw: "androidx.window.sidecar")
A: android:required(0x0101028e)=(type 0x12)0x0
[ +6 ms] Stopping app 'app-debug.apk' on sdk gphone64 x86 64.
[ ] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 shell am force-stop
com.example.amazon_echo_page
[ +65 ms] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 shell pm list packages
com.example.amazon_echo_page
[ +97 ms] package:com.example.amazon_echo_page
[ +1 ms] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 shell cat
/data/local/tmp/sky.com.example.amazon_echo_page.sha1
[ +47 ms] 3a2dbb94e641ceb1c011256a71b600fb6d6342f3
[ +1 ms] Latest build already installed.
[ ] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 shell -x logcat -v time -t 1
[ +51 ms] --------- beginning of main
02-14 21:13:59.045 D/CarrierSvcBindHelper( 921): No carrier app for: 0
[ +4 ms] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 shell am start -a
android.intent.action.MAIN -c android.intent.category.LAUNCHER -f 0x20000000 --ez enable-dart-profiling true --ez
enable-checked-mode true --ez verify-entry-points true
com.example.amazon_echo_page/com.example.amazon_echo_page.MainActivity
[ +70 ms] Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x20000000
cmp=com.example.amazon_echo_page/.MainActivity (has extras) }
[ +1 ms] Waiting for observatory port to be available...
[ +559 ms] Observatory URL on device: http://127.0.0.1:36213/YB2WX5_tTgw=/
[ +1 ms] executing: C:\src\Android\SDK\platform-tools\adb.exe -s emulator-5554 forward tcp:0 tcp:36213
[ +40 ms] 60200
[ ] Forwarded host port 60200 to device port 36213 for Observatory
[ +4 ms] Caching compiled dill
[ +31 ms] Connecting to service protocol: http://127.0.0.1:60200/YB2WX5_tTgw=/
[ +262 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at
http://127.0.0.1:60200/YB2WX5_tTgw=/.
[ +171 ms] DDS is listening at http://127.0.0.1:60203/WwK9SPk9WF0=/.
[ +53 ms] Successfully connected to service protocol: http://127.0.0.1:60200/YB2WX5_tTgw=/
[ +71 ms] DevFS: Creating new filesystem on the device (null)
[ +31 ms] DevFS: Created new filesystem on the device
(file:///data/user/0/com.example.amazon_echo_page/code_cache/amazon_echo_pageNQVHSV/amazon_echo_page/)
[ +3 ms] Updating assets
[ +107 ms] Manifest contained wildcard assets. Inserting missing file into build graph to force rerun. for more
information see #56466.
[ +5 ms] Syncing files to device sdk gphone64 x86 64...
[ +3 ms] Compiling dart to kernel with 0 updated files
[ ] Processing bundle.
[ +1 ms] <- recompile package:amazon_echo_page/main.dart 06fa5efe-3a35-4146-8cc0-5480b01cce6b
[ ] <- 06fa5efe-3a35-4146-8cc0-5480b01cce6b
[ +2 ms] Bundle processing done.
[ +87 ms] Updating files.
[ ] DevFS: Sync finished
[ +2 ms] Syncing files to device sdk gphone64 x86 64... (completed in 97ms)
[ +1 ms] Synced 0.0MB.
[ +4 ms] <- accept
[ +8 ms] Connected to _flutterView/0x72f67ca58530.
[ +2 ms] Flutter run key commands.
[ +1 ms] r Hot reload.
[ +4 ms] R Hot restart.
[ +1 ms] h List all available interactive commands.
[ +1 ms] d Detach (terminate "flutter run" but leave application running).
[ ] c Clear the screen
[ ] q Quit (terminate the application on the device).
[ ] Running with sound null safety
[ ] An Observatory debugger and profiler on sdk gphone64 x86 64 is available at:
http://127.0.0.1:60203/WwK9SPk9WF0=/
[ +582 ms] The Flutter DevTools debugger and profiler on sdk gphone64 x86 64 is available at:
http://127.0.0.1:9101?uri=http://127.0.0.1:60203/WwK9SPk9WF0=/
No issues found! (ran in 1.5s)
[√] Flutter (Channel stable, 3.7.0, on Microsoft Windows [Version 10.0.19045.2546], locale en-US)
• Flutter version 3.7.0 on channel stable at C:\src\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision b06b8b2710 (3 weeks ago), 2023-01-23 16:55:55 -0800
• Engine revision b24591ed32
• Dart version 2.19.0
• DevTools version 2.20.1
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
• Android SDK at C:\src\Android\SDK
• Platform android-33, build-tools 33.0.1
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
• All Android licenses accepted.
[√] Chrome - develop for the web
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[√] Visual Studio - develop for Windows (Visual Studio Build Tools 2022 17.4.0)
• Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools
• Visual Studio Build Tools 2022 version 17.4.33103.184
• Windows 10 SDK version 10.0.22621.0
[√] Android Studio (version 2022.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
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• Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
[√] Connected device (4 available)
• sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64 • Android 12 (API 32) (emulator)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.19045.2546]
• Chrome (web) • chrome • web-javascript • Google Chrome 109.0.5414.120
• Edge (web) • edge • web-javascript • Microsoft Edge 109.0.1518.70
[√] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!

Answer 1

You can use Align widget for this case, else provide width or left and right value.
final index = widget.children.indexOf(element);
return Positioned(
top: 200 + (index * 10),
left: 0,
right: 0,
child: Transform.scale(
scale: 1,
child: element,
),
);