`ChunkSlice::point_utf16_to_offset` returned `line.len()` (a relative
line byte length) instead of `row_offset_range.end` (the absolute byte
offset within the chunk) when clipping an out-of-range UTF-16 column on
a non-first row.
This caused incorrect position calculations in LSP coordinate
conversions whenever a UTF-16 point had a column beyond the line's
extent on any row after the first in a chunk.
Added a regression test covering clipping on both row 0 and row 1. Not
sure if it's the best place for a test like this one though.
Release Notes:
- N/A
Jordi Villar
4ed2b3d041