[Web] Update modifier state when Meta key is seen as Process key #50779
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Description
On Web, browsers can emit key events with a logical key sets to
Process
when the physical key is MetaLeft. Because the modifier state is 0 despite Meta key being pressed this will trigger an assert.This PR adds some logic for this specific case. Maybe a more slightly broader solution will be needed (using the same logic for all modifiers ?). I focused on MetaLeft because it was directly reported on flutter/flutter#141186.
Related Issue
Fixes flutter/flutter#141186.
Tests
Adds 1 test.