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  Fix proportional font rendering with pixel-based horizontal scroll

  kyle released this 2026-03-31 21:18:53 +00:00 | 2 commits to master since this release

  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

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