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* feat(editor): add IDE-style line ops (duplicate / delete) Addresses #6433 — the issue asked for VS-Code-style multi-line editing for collaborative markdown editing. Full multi-cursor support would need a rep-model rewrite; this PR lands the two highest-value single-cursor line ops now so users get the actual ergonomic wins without that lift: - Ctrl/Cmd+Shift+D: duplicate the current line, or every line in a multi-line selection. Duplicates land directly below the original block, so the caret visually stays with the original content — same as VS Code / JetBrains. - Ctrl/Cmd+Shift+K: delete the current line (or every line in a multi-line selection), collapsing the range including its trailing newline. Handles edge cases: last-line selections consume the preceding newline; a whole-pad selection leaves one empty line behind (Etherpad always expects at least one). Both ops run through `performDocumentReplaceRange`, so they're collaborative-safe: other clients see the change arrive as a normal changeset, and the operation is a single undo entry. Wire-up: - `src/node/utils/Settings.ts`: extend `padShortcutEnabled` with `cmdShiftD` / `cmdShiftK` (both default true so fresh installs get the feature without config; operators who pin shortcut maps can disable them individually). - `src/static/js/ace2_inner.ts`: new `doDuplicateSelectedLines` / `doDeleteSelectedLines` helpers, exposed on `editorInfo.ace_*` so plugins and tests can invoke them programmatically, and keyboard handlers for Ctrl/Cmd+Shift+D and Ctrl/Cmd+Shift+K. Test plan: Playwright spec covers the three interesting paths (single-line duplicate, single-line delete, multi-line duplicate). Closes #6433 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * test(6433): type the bodyLines helper parameter * fix(6433): preserve char attributes on duplicate + correct whole-pad delete Addresses Qodo review feedback on #7564: 1. `doDuplicateSelectedLines` was inserting raw line text via `performDocumentReplaceRange`, which carries only the author attribute — every other character-level attribute on the source line (bold, italic, list, heading, link) was dropped, and in some cases Etherpad's internal `*` line-marker surfaced as literal text. Rewrite to build the changeset directly: walk each source line's attribution ops from `rep.alines[i]`, split the line text at op boundaries, and call `builder.insert(segment, op.attribs)` once per op. Each attribute segment from the source ends up on the duplicate verbatim. Wrapped in `inCallStackIfNecessary` for the standard fastIncorp + submit cycle. 2. `doDeleteSelectedLines` whole-pad case deleted from `[0, 0]` to `[0, lastLen]` even when the selection spanned multiple lines, leaving later lines in place and sometimes producing an invalid range when `lastLen` exceeded line 0's width. Change to `[end, lastLen]` so every selected line is cleared, with one empty line retained for the final-newline invariant. 3. Added `ace_doDuplicateSelectedLines` / `ace_doDeleteSelectedLines` entries to `doc/api/editorInfo.md` so plugin authors can discover the new surface. 4. New Playwright spec asserting `<b>` tags survive duplication. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * revert(6433): drop the attributed-duplicate changeset, keep whole-pad delete fix The attributed-changeset rewrite for doDuplicateSelectedLines tripped over the insertion-past-final-newline edge case — CI caught the basic single-line duplicate regressing (gamma → [alpha, beta, gamma] with no new gamma appearing because the hand-rolled changeset ended up invalid at the end-of-pad boundary). performDocumentReplaceRange handles that edge case internally, but only with a uniform author-attribute insert. Revert duplicateSelectedLines to the simpler performDocumentReplaceRange form that CI was happy with. Flag the attribute-preservation gap explicitly in the code so a follow-up can bolt on a proper attributed insert without re-inventing the end-of-pad handling. Whole-pad delete fix and editorInfo.md docs stay. Attribute-preservation test in line_ops.spec.ts is removed along with the broken code. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>