Linus Groh cab032f1ee LibGfx+LibGUI: Support multi code point emojis in text painting :^) ...

This necessitates switching from passing a single code point to the
callback to passing a non-const Utf8CodePointIterator instead.

Note that the text selection mechanisms in LibGUI and LibWeb don't
handle this properly yet; they still assume that each code point
renders as one glyph. Similarly, width calculations for text widths
don't either, so a single such an emoji will require space for more
than one glyph.

It also doesn't work in LibVT's TerminalWidget, where each code point
is handled and rendered separately, so LibGfx never gets a chance to
check if subsequent code points could result in a combined emoji.

2022-02-23 21:53:30 +00:00

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