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Levi Neuwirth db073cc668 CUA type-over is a single undo step (Q#U1) 
Typing over a selection composed two edits in Lua —
delete_region() + insert_char() — so it recorded two undo steps:
one undo left the half-replaced text, two restored the original.
Undo granularity is per apply_edit in both modes (v0.1 pushes one
UndoEntry per edit; CRDT commits per edit via export and groups by
commit, with record_checkpoint unused), so the fix is to make
type-over one edit.

New core EditorCore::insert_char_over_region emits a single
EditOp::Replace when a region is active (cursor past the inserted
bytes, selection cleared) and delegates to insert_char otherwise.
The three type-over commands (buffer.newline / tab / self-insert)
call it via a new Lua binding instead of the delete+insert pair.
delete_region and insert_char are unchanged for their other
callers; region-aware backspace/delete already emit one op.

Verified one undo unit in BOTH modes (dual_mode
replace_is_a_single_undo_step covers v01 + crdt — a CRDT Replace is
delete-then-insert internally but one commit) plus an end-to-end
acceptance test through the key-dispatch path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
 		2026-06-15 20:00:53 -04:00
..
common M11.1: semantic-frontend protocol scaffolding (wire + capability) 2026-05-18 19:39:07 -04:00
fixtures V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
cua_region_acceptance.rs CUA type-over is a single undo step (Q#U1) 2026-06-15 20:00:53 -04:00
m3_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m4_acceptance.rs style: cargo fmt over the optimistic-editing arc 2026-06-10 11:53:50 -04:00
m5_5_acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
m5_6_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m5_7_acceptance.rs CI fixes 2026-05-18 12:24:35 -04:00
m5_8_acceptance.rs tests: widen backoff timing signal 2026-05-25 13:32:54 -04:00
m5_perf_acceptance.rs M11.1: semantic-frontend protocol scaffolding (wire + capability) 2026-05-18 19:39:07 -04:00
m6_4_repl_acceptance.rs Fix PTY final-output drain race 2026-05-04 09:44:30 -04:00
m6_5_repl_acceptance.rs tests: quarantine macOS PTY marker cases 2026-05-25 13:02:46 -04:00
m6_7_scrollback_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m6_8_multi_repl_acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
m6_perf_acceptance.rs tests: tune M6 hosted perf profile 2026-05-25 13:43:28 -04:00
m7_3_acceptance.rs Fix CI and Documentation issues 2026-05-04 10:19:19 -04:00
m7_5_acceptance.rs Pin toolchain to 1.95.0 + mechanical clippy/rustc fixes 2026-05-18 11:38:57 -04:00
m7_6_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_7_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_8_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_9_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_10_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_11_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_review_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1_acceptance.rs Pin toolchain to 1.95.0 + mechanical clippy/rustc fixes 2026-05-18 11:38:57 -04:00
m8_1c_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1d_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_2_acceptance.rs tests: stabilize hosted perf gates 2026-05-25 13:20:18 -04:00
m8_3_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_5_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_6_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_7_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_9_acceptance.rs V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
m8_10_acceptance.rs V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
m9_1_acceptance.rs T M4.5 async bridge: LSP requests settle async-runtime jobs 2026-05-18 19:36:17 -04:00
m9_2_acceptance.rs style: from_secs(1) for the m9_2 harvest wait (clippy duration units) 2026-06-10 12:07:08 -04:00
m9_3_acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
m9_4_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_5_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_6_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_7_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_8_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m10_2_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_postcard_unknown_variant.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_11_acceptance.rs M11.1: semantic-frontend protocol scaffolding (wire + capability) 2026-05-18 19:39:07 -04:00
m10_11_perf.rs M10.11: adversarial two-laptop acceptance + jitter; the M10 arc verified 2026-05-15 20:51:00 -04:00
m11_5_semantic_acceptance.rs M11.5: semantic frontend<->instance glue (SemanticClient + e2e) 2026-05-18 21:24:36 -04:00