Clean up and complete text input handling

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Goals

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1. Correctly translate web text input events to Qt text input events.

• The web events are fairly well specified and documented
• Event ordering varies between browsers
• There is a certain amount of surprising cases

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1. Send the expected combination of key press/release and input events to Qt

• We are currently sending input events in cases where Qt expects keypress

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1. Remove code which duplicates the browser's implementation

• e.g. dead key handling

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1. Develop auto test to prevent regressions

• Ideally we want to have a test which verifies that we handle all possible browser behaviors
• Without having to run the test on all browser + input language combinations.
• Synthesize web events?

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Test cases / Definition of Done / Acceptance

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For all browsers/platforms:

• Simple typing should generate keypress / keyrelease
• Key repeat generates repeat events
• Handle langues
  • Simplified Chinese
  • Korean
• Virtual keyboard input (with word prediction)
• Dead key compose: ¨ + u -> ü
• macOS press-and-hold for character variant

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Related

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QTBUG-139596 (Web platform key events overview)

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w3c key event viewer: https://w3c.github.io/uievents/tools/key-event-viewer.html

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QKeyEvent manual test: qtbase/tests/manual/keyevents
QInputEvent manual test: git.qt.io/mosorvig/qt-webassembly-development/-/tree/a9cb44531d8aaa9b557944e3a17b071ff68e431f/qinputmethodevent

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QTBUG-116873 (background on shortcut handling)

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