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83352c4571
ekp/.phrase/phases/phase-kp-overhaul-20260726/change_text_property_layout_research_20260729.md
Kinneyzhang 83352c4571 feat!: add source-clean live buffer layout 
Replace the physical ekp-region renderer with ekp-buffer text-property projection backed by shared semantic layout plans and stable live-edit transactions.

Optimize the C-backed resize hot path, and add deterministic performance, ERT, GUI, fuzz, release, and documentation coverage for task017 through task032.

BREAKING CHANGE: require ekp-buffer instead of ekp-region and rename module-owned ekp-region-* settings to ekp-buffer-*.
2026-07-30 01:07:25 +08:00

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Change Log: Text-Property Layout Research 2026-07-29

task018 / issue011

  • Add — .phrase/phases/phase-kp-overhaul-20260726/tech-refer_text_property_layout_20260729.md

    • Recorded the user-mandated text-property-only direction.
    • Mapped KP boxes, Latin/CJK glue, indentation, chosen breaks, and discretionary hyphens to Emacs display properties.
    • Recorded official documentation/source evidence, exact boundaries, and a minimum GUI verification gate.
    • Proposed a non-polluting Latin hyphen representation in which the preceding source grapheme displays as GRAPHEME + HYPHEN + NEWLINE.

  • Modify — .phrase/phases/phase-kp-overhaul-20260726/issue_logical_text_api_20260728.md

    • Marked design research as resumed while keeping the issue open.
    • Added the confirmed primitives, Emacs 30.2 GUI probe results, proposed hyphen owner, and unresolved architecture constraints.

  • Modify — .phrase/phases/phase-kp-overhaul-20260726/task_repository_audit_20260728.md

    • Added and completed documentation-only task018.

  • Modify — .omx/plans/prd-ekp-seamless-live-layout.md, .omx/plans/test-spec-ekp-seamless-live-layout.md

    • Added a supersession notice so the prior overlay-oriented prototypes are not executed after the user's text-property-only decision.

  • Modify — .phrase/docs/CHANGE.md

    • Indexed this phase change.

Behavior and Risk

  • No runtime source, test implementation, package API, or persisted file format changed.
  • The recorded GUI probes used temporary buffers in clean Emacs 30.2 daemons and left no repository or user-buffer state.
  • Static LTR feasibility is evidence, not proof of live editing, multi-window independence, bidi correctness, or foreign display-property composition.
  • issue011 remains open.

Validation

  • Official GNU Emacs display/text-property documentation was cross-checked against the Emacs 30.2 display source.
  • GUI glue probe: a natural 7px source space rendered at exact 3px and 20px targets through combined space-width and min-width; source characters were unchanged.
  • GUI hyphen probe: abcdefgh remained eight source characters while a property on d displayed d-\n, produced two screen lines, moved one visual line to source position 5, and honored a 20px line-prefix.
  • Documentation links, task/change traceability, Markdown structure, and git diff --check were inspected.