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Compatibility with screen readers

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There are people who use screen readers to play Cataclysm Bright Nights. In order for screen readers to announce the most important information in a UI, the terminal cursor has to be placed at the correct location. This information may be text such as selected item names in a list, etc, and the cursor has to be placed exactly at the beginning of the text for screen readers to announce it.

The recommended way to place the cursor is to use ui_adaptor. This ensures the desired cursor position is preserved when subsequent output code changes the cursor position. You can call ui_adaptor::set_cursor and similar methods at any position in a redrawing callback, and the last cursor position of the topmost UI set via the call will be used as the final cursor position. You can also call ui_adaptor::disable_cursor to prevent a UI’s cursor from being used as the final cursor position.