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a393347673
Problem: A multi-line extmark that ends exactly at a deleted range end
is not invalidated.
Revalidated sign mark is added with incorrect range.
Solution: Remove questionable invalidation range condition which was
originally added to avoid deleting a mark that ends below a
deleted line.
Since splicing for a deleted line, and a replaced range that
explicitly ends at column 0 beyond a deleted line is identical,
we can't try to distinguish these two cases. I.e. :1delete 1
and nvim_buf_set_text(0, 0, 0, 1, 0, {}) yield the same splice
operation.
This means that a multi-line sign_text mark should now span at
least one column beyond its end_row, as seen in the adjusted
test. This is still somewhat unexpected/inconvenient to me
which is what prompted me to try to avoid it with the original
condition.
Add revalidated sign mark back to decor with correct range;
third sign mark added to test exposed a crash.