Kyle Isom 81a5c25071 Fix proportional font rendering with pixel-based horizontal scroll ...

The GUI renderer had two competing horizontal scroll systems: a
character-based one (coloffs × space_w) and a pixel-based one. For
proportional fonts the character-based system used "M" width to
calculate viewport columns, triggering premature scrolling at ~50%
of the actual display width.

Switch the GUI renderer to purely pixel-based horizontal scrolling:
- Remove coloffs↔ImGui scroll_x bidirectional sync
- Measure rx_to_px from column 0 (absolute) instead of from coloffs
- Draw full expanded lines; let ImGui clip via its scroll viewport
- Report content width via SetCursorPosX+Dummy for the scrollbar
- Use average character width for cols estimate (not "M" width)

The terminal renderer continues using coloffs correctly—no changes
needed there.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-31 14:18:53 -07:00

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