[Web] offset != null

Nobody has claimed this yet.

Flutter Web:
If you put a file on the drag zone, an error occurs as shown below.

Error

_handleMethodChannel: Assertion failed: file:///Users/patr _offset != null
is not true dart-sdk/lib/internal/js_dev_runtime/priva dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart packages/desktop_drop/src/channel.dart 96:24 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 packages/desktop_drop/src/channel.dart 40:36 packages/desktop_drop/src/channel.dart 33:22 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 packages/desktop_drop/src/channel.dart 31:36 packages/flutter/src/services/platform_channel.dart 404:55 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 packages/flutter/src/services/platform_channel.dart 401:40 packages/flutter/src/services/platform_channel.dart 397:34 packages/flutter/src/services/binding.dart 380:35 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 packages/flutter/src/services/binding.dart 377:98 lib/_engine/engine/platform_dispatcher.dart 1121:13 lib/ui/channel_buffers.dart 25:12 lib/ui/channel_buffers.dart 65:7 lib/ui/channel_buffers.dart 130:16 packages/flutter_web_plugins/src/plugin_registry.dart 144:23 packages/flutter/src/services/platform_channel.dart 157:52 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 packages/flutter/src/services/platform_channel.dart 155:30 packages/flutter/src/services/platform_channel.dart 340:12 packages/desktop_drop/desktop_drop_web.dart 55:17 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/ dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/ dart-sdk/lib/html/dart2js/html_dart2js.dart 37285:58 ick386/.pub-cache/hosted/pub.dartlang.org/desktop_drop-0.3.3/lib/src/channel.dart:96:16
te/ddc_runtime/errors.dart 251:49 throw
29:3 assertFailed
_handleMethodChannel
runBody
_async
[_handleMethodChannel]

runBody
_async

_handleAsMethodCall
runBody
_async
[_handleAsMethodCall]

runBody
_async

invoke2
invoke
push
push
send
_invokeMethod
runBody
_async
[_invokeMethod]
invokeMethod

operations.dart 334:14 _checkAndCall
operations.dart 339:39 dcall

Flutter doctor -v

[✓] Flutter (Channel stable, 3.0.0, on macOS 12.4 21F79 darwin-arm, locale ko-KR)
• Flutter version 3.0.0 at /Users/patrick386/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision ee4e09cce0 (2 weeks ago), 2022-05-09 16:45:18 -0700
• Engine revision d1b9a6938a
• Dart version 2.17.0
• DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
• Android SDK at /Users/patrick386/Library/Android/sdk
• Platform android-32, build-tools 32.1.0-rc1
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.3

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] Connected device (2 available)
• macOS (desktop) • macos • darwin-arm64 • macOS 12.4 21F79 darwin-arm
• Chrome (web) • chrome • web-javascript • Google Chrome 101.0.4951.64

[✓] HTTP Host Availability
• All required HTTP hosts are available

• No issues found!

Start with lib/src/channel.dart at the reported assertion on line 96 and the web entry point in desktop_drop_web.dart around line 55. Reproduce the drag-and-drop case in Flutter Web using the issue's environment details, then verify that dropping a file no longer triggers the _offset assertion.

Written by the indexing model from the issue text.

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