Matthias Clasen 54daad3878 gtk-demo: Avoid a segfault ...

The code in the fontrendering demo is a bit sloppy
and assumes that we always get a single run when
appending a sequence of 4 chars and 4 spaces.

That is not in general true, such as for Emoji.

Instead of working harder to handle Emoji here,
just give up and fall back to 'a'.

Fixes: #5166

2022-09-09 12:34:54 -04:00

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