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Buffer: change clamp logic to preserve ordering

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clamp could change ordering between a coordinate past the end.

Say in a buffer with 1 line of 2 char:
{0, 1} was clamped to {0, 1}
{1, 0} was clamped to {0, 0}

That was reversing their ordering, and might be the root cause
of the bug lurking in undo range computation.
This commit is contained in:
Maxime Coste 2017-11-07 23:56:24 +08:00
parent 80ce768994
commit d45f16b6c8
1 changed files with 3 additions and 1 deletions
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4
src/buffer.cc
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@ -172,7 +172,9 @@ BufferIterator Buffer::iterator_at(BufferCoord coord) const
BufferCoord Buffer::clamp(BufferCoord coord) const
{
coord.line = Kakoune::clamp(coord.line, 0_line, line_count() - 1);
if (coord > back_coord())
coord = back_coord();
kak_assert(coord.line >= 0 and coord.line < line_count());
ByteCount max_col = std::max(0_byte, m_lines[coord.line].length() - 1);
coord.column = Kakoune::clamp(coord.column, 0_byte, max_col);
return coord;