The typesetter was incorrectly measuring line width when expressions contained
superscripts or subscripts (e.g., b²). After rendering a superscript, the line
is split into multiple display segments, but the width checking code was only
measuring the current segment, not the total visual line width.
Key changes:
- Use currentPosition.x to track actual horizontal position across all segments
- Calculate visualLineWidth = currentPosition.x + currentSegmentWidth
- Pass remainingWidth (maxWidth - currentPosition.x) to findBestBreakPoint
- Apply fix to both interatom breaking and inline text breaking
This fixes truncation issues where content like "Δ=b²-4ac avec a=1..." was
being clipped instead of wrapped to a new line.
Before: Each segment checked in isolation → segments appeared to fit individually
but total visual width exceeded maxWidth → content truncated/clipped
After: Total visual width tracked correctly → line breaking triggered when
actual visual width exceeds maxWidth → content wraps properly
3aa6c6c98b