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On eb_backspace, when the upper line was non-null, line_cat followed
by line_free, and eb_delete_line only cleared the line_vec. However,
commit 2441e78 introduced an additional line_free in eb_delete_line to
fix a memory leak, which led to a double-free for that line. This
patch resolves that problem.
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This patch removes the per-line cursor cache (`line->cursor`),
reducing implementation complexity. Vertical cursor movement (up/down)
now uniformly places the cursor at the beginning of the line, instead
of trying to restore the previous horizontal position. UX
considerations such as column preservation will be revisited after
core stabilization.
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vec_len is O(1) and it would be fast enough to use it.
introduce line_lazy_init for lazy load (allocate each line when
actually edit it!) per line.
[minor]
remove obsolate line_delete_trailing.
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test.c to *_line.c and *_vector.c
also implement unit test vector_suite::resize too.
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