more tolerant Buffer::string
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@ -129,7 +129,7 @@ LineCount Buffer::line_count() const
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String Buffer::string(const BufferCoord& begin, const BufferCoord& end) const
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{
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String res;
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for (LineCount line = begin.line; line <= end.line; ++line)
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for (auto line = begin.line; line <= end.line and line < line_count(); ++line)
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{
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ByteCount start = 0;
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if (line == begin.line)
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