[property editor] invalid line number exception

Date: 2025-06-15
DevTools version: 2.47.0
Error: Invalid line number
Stack trace:
```
file:///b/s/w/ir/x/w/rc/tmpus7c8t8d/hosted/pub.dev/dtd-2.5.1/lib/src/dart_tooling_daemon.dart 190:23 \| call file:///b/s/w/ir/x/w/devtools/packages/devtools_app/lib/src/shared/editor/editor_client.dart 412:17 \| _callLspApi file:///b/s/w/ir/x/w/devtools/packages/devtools_app/lib/src/shared/editor/editor_client.dart 326:30 \| _callLspApiAndDeserializeResponse file:///b/s/w/ir/x/w/devtools/packages/devtools_app/lib/src/shared/editor/editor_client.dart 252:9 \| getEditableArguments file:///b/s/w/ir/x/w/devtools/packages/devtools_app/lib/src/standalone_ui/ide_shared/property_editor/property_editor_controller.dart 211:16 \| _updateWithEditableWidgetData
```
CC @elliette

Start with packages/devtools_app/lib/src/standalone_ui/ide_shared/property_editor/property_editor_controller.dart at _updateWithEditableWidgetData and trace getEditableArguments through editor_client.dart. Reproduce the reported invalid line number exception if possible, then determine the expected handling and add coverage for the failing property-editor path.

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