Maxime Coste d43268fbeb Fix invalid access of display line end ... When a line only contains non-range atoms we can end-up accessing past the end atom. Add a test that shows the issue when run with valgrind, it is unfortunately quite hard to trigger a crash because the invalidly accessed byte usually leads to the correct code path being taken (when != DisplayAtom::Range) so we have only 1 in 255 chance of triggerring a crash. Fixes #4927		2023-06-20 13:09:03 +10:00
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