Bruno Leroux fea415faa0 [Web+Linux] Fix pressing Meta keys throws (flutter/engine#41694)
## Description

This PR fixes Meta keys throwing exception on Chrome Linux.

The assertions throws because the DOM event sent when Meta keys is pressed is not coherent when Meta is the only pressed key.

## Related Issue

Fixes https://github.com/flutter/flutter/issues/125672

## Tests

Adds 1 test.
2023-05-12 21:46:17 +00:00
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