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# Invalid UTF-8 must RENDER, never panic. Two sources, both ordinary use:
# a file pane holds whatever bytes are on disk (latin-1, a truncated sequence,
# an ELF opened by mistake). Undecodable bytes come out as U+FFFD, while
# horizontal scrolling must start at a complete grapheme boundary.
file bad.txt hello \xff\xfe world\nlatin-1 caf\xe9 tail\ntruncated \xe6\x97 here\nend\n
file wide.txt \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e tail\nsecond line\n
start 31 100 bad.txt
wait 8000 Newcol Joincol
stable 700 20000
snap badbytes
# 50 columns, not 100: a FILE boots alone and fills the window, and at 100 the
# whole line fits, so `$` scrolls nowhere. This is
# the width the left column used to be, i.e. the pane this case was written for
start 31 50 wide.txt
wait 8000 Newcol Joincol
stable 700 20000
# SPC t w turns soft wrap OFF: hscroll is the other half of this case and a
# wrapped body has nothing to scroll sideways. The unwrapped view must keep the
# first visible CJK glyph intact instead of starting inside its UTF-8 bytes.
key space t w
stable 400 5000
key g l
stable 700 10000
snap hscroll-midglyph
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