Text box: keys to the focused gadget, then SDL_TEXTINPUT for every layout

[CubeB]

UiTextBox turns key presses into characters through a hand-written US layout table, so a player on another keyboard layout gets the wrong characters in a save-game name.

SDL's SDL_EVENT_TEXT_INPUT gives composed text for any layout, but a panel broadcasts key events to every child, so text input would reach every text box at once. Two steps:

1. Key events go to the panel's focused gadget only. The original keeps a focused-gadget index at panel+0x64 (§99).
2. The text box takes SDL_EVENT_TEXT_INPUT and the layout table goes.

Where to look: src/rwe/ui/UiPanel.*, src/rwe/ui/UiTextBox.*, the event dispatch in SceneManager::execute, and src/rwe/ui/UiTextBox.test.cpp.

Watch for: the two subscription-lifetime hazards in CLAUDE.md; both have crashed the game before.

Done when: a save name typed on a non-US layout comes out as typed, with tests for the focus routing.

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One item, one PR. Opened from the unchecked Phase 1 list in docs/ROADMAP.md; the findings it cites are in docs/TOTALA-EXE.md.

[CubeB]

Done, both steps.

1. Keys go to the focused gadget. UiPanel::keyDown handed every key to every child. A key now goes to the focused control alone, as the original's focused-gadget index at panel+0x64 implies — §99 notes it is the only focus test in the whole gadget renderer, the one the caret is drawn from. keyUp is routed the same way.

That fixed a second thing nobody had reported: Space pressed every button on a panel at once, since UiStagedButton::keyDown activates on Space and every button received it.

A quickkey is the exception and still works wherever the focus is (§78), through a new UiComponent::matchesQuickKey that the panel scans before falling back to the focused control. A disabled button matches nothing, so it doesn't swallow the key either. While a text box has the focus it takes every key: a letter that is also some button's quick key belongs in the name being typed.

2. The layout table is gone. SDL_EVENT_TEXT_INPUT is dispatched from SceneManager to Scene::onTextInput, and both scenes route it to the focused control. SDL3 sends no text events until asked, so GameLaunch starts text input with the window; it stays on for the window's life, because the panels decide who receives what is typed. The box keeps printable ASCII only — a save name is a filename, and the font has one glyph to a byte — and keyDown keeps only backspace.

Tests. New src/rwe/ui/UiPanelFocus.test.cpp: Space presses the focused button and no other, nothing focused presses nothing, a quick key reaches its own button from elsewhere, a focused text box takes the letter instead, text reaches one box and not its neighbour, backspace deletes from the focused one. src/rwe/ui/UiTextBox.test.cpp is rewritten around text input, including the length cap and the non-ASCII filter. Full suite passes on MinGW Debug and Release.

The subscription-lifetime hazards were watched for: the new test's subscriptions are owned by the components themselves via addSubscription, and no new Subject was added.

🤖 Generated with Claude Code

https://claude.ai/code/session_018moxVoyHDBoHqkw8uqS3HX