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feat(split): two tabs side by side on top of herdr's own layout - #861
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Ports the browser split from devswha#602 onto PaneCanvas (devswha#726, devswha#747): each half draws its tab at herdr's layout, so a tab herdr already split shows all of its panes inside the half. One tab is never drawn in both halves. - A tab dragged down out of its strip, or a sidebar row dragged over the pane area, opens in the half it is dropped on. The strip keeps its pointer reorder; leaving the strip hands the drag to the split guide. - Only the active half's selected pane is active: the other half never takes the keyboard or reports the header's connection. - A pane closed in the other half hands over to another pane of its tab. - Drag guide from flam-ing's follow-up (#1): the guide shows as soon as a drag starts, one indicator slides between halves, a 12px band keeps the side steady at the centre, and Escape, blur or a drop elsewhere cancels. Co-authored-by: flam-ing <300052295+flam-ing@users.noreply.github.com>
…, one shared connection; changelog
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📝 Summary
Merge Risk: 🔵 Low · up to Desktop split view adds side-by-side tabs that persist across reloads and has broad regression coverage. The only known open item is a missing PR link in the changelog entry. The change is mergeable with that small follow-up. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 57.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 15 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Title check The title clearly identifies the main change: a split view that displays two tabs side by side while preserving herdr's layout. Description check The description includes the required Change and Validation sections. It explains the behavior, scope, interaction rules, persistence, and test results in sufficient detail. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Actionable comments posted: 2
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Inline comments:
Review comments at @CHANGELOG.md:
- Around line 11-18: Update the “Two tabs side by side” changelog entry to
append the full PR #861 link, following the section’s existing link format;
preserve its current wording and author credit.
Review comments at @src/App.tsx:
- Around line 269-310: Update storedSplit and storeSplit to read and write split
state in sessionStorage instead of localStorage, keeping split state scoped to
the browser window and consistent with storedSelection.
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📒 Files selected for processing (19)
CHANGELOG.mdscripts/split-view-regression.tsscripts/ui-regression.tssrc/App.tsxsrc/components/Sidebar.tsxsrc/components/SplitDropPreview.csssrc/components/SplitDropPreview.tsxsrc/components/TabStrip.csssrc/components/TabStrip.tsxsrc/lib/i18n.ja.tssrc/lib/i18n.ko.tssrc/lib/i18n.tr.tssrc/lib/i18n.zh.tssrc/lib/paneDrag.test.tssrc/lib/paneDrag.tssrc/lib/split.test.tssrc/lib/split.tssrc/lib/useTabReorder.tssrc/styles.css
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Owner
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Maintainer review complete; ready to merge (not merged).
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devswha
previously approved these changes
Oct 12, 2026
devswha
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Reviewed the split-state/drag logic and App integration, with independent read-only review lanes. Prepared the PR without merging it.
Fixes pushed:
- Integrated current main, preserving the LAN exposure notice and both changelog entries.
- Kept split persistence scoped to each browser tab/window with sessionStorage; added a two-page reload regression.
- Prevented right/middle/macOS Control-click from activating the inactive half.
- Kept explicit lens choices in memory when storage writes fail, including after activation.
- Restored the phone glass-header selectors for the nested split DOM without covering notices or tab strips.
- Removed a stale half for a deleted PC only after the authoritative roster arrives.
Verification on a8695e1: all GitHub CI jobs passed, including Fast checks, both browser lanes, integration, native Windows, and macOS. Local fast checks passed. The first final-head local UI run passed all new split cases but timed out at the existing mobile-plan fixture; the same full UI suite passed in final-head CI, and a local repeat is running. No test was skipped or weakened.
Both existing review threads are addressed and resolved. No remaining merge-blocking findings. No HTTP/WS contract or demo-transport change is needed: this is client-side composition of the existing pane APIs.
…oth halves Review follow-ups on devswha#861 (Codex astra medium, 2026-10-12): - A press on a sibling pane in the other half (herdr's own split of its tab) activated the half and then, in the same event, picked the pane from the state before the event: the pick undid the activation and left one tab in both halves, which the reconciliation then closed. `selectInSlot` now activates the half and selects the picked pane in one `applySplit`, keeping the focus where a Tab put it. A new tab opened in the other half activates it the same way. - A saved split whose other half is the linked pane's own tab, or a pane moved across the halves, drew the tab in both halves before the effect ended the split: the tab's panes attached twice on the PC's one socket, and the detach of the half that closed took the survivor's attachment with it. The other half is not drawn while the halves overlap; the effect still ends the split. - On a window too narrow for both halves, picking the hidden half's pane (sidebar, link) made the selection equal to the other half and the split was lost. The pick trades the halves whether or not the other half is drawn; alerts keep their drawn-only condition. - A file or text dropped into the other half reached a terminal that an upload's paths and the focus never do: the drop makes that half active first (pane drags excepted). - split-view regression: a sibling press in the other half, the narrow window's pick and widening, an overlapping saved split with a line typed into the surviving terminal. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Owner
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Second maintainer pass (Codex review, 2026-10-12); follow-ups pushed as d3cac12 on top of a merge of current main (ea5b371, no conflicts):
Verified locally: typecheck, build, unit tests, full |
This was referenced Oct 12, 2026
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Refs #792. A fresh take on #602, rebuilt on current
main(0.4.8 + #854) aroundPaneCanvasinstead of next to it. @flam-ing's drag guide (Yoonwoo-Ha#1) is folded in, with credit in the commit.Change
On a desktop (≥ 769px), two tabs can stand side by side, from different workspaces or PCs.
How it fits next to herdr's own layout (#726, #747).
PaneCanvasfor its own tab. A tab herdr has already split shows all its panes inside the half, at herdr's layout.Opening a half.
useTabReordergets an optionaloutsidesink →lib/paneDrag.ts).The guide (from Yoonwoo-Ha#1).
Each half.
active. The other half never takes the keyboard or reports the header's connection.mayTakeFocusfrom feat(split): two panes side by side, by dragging a tab or a sidebar row #602 are gone: main'sactiveprop and the shared per-PC connection (feat(ui): align pane controls and navigation with herdr TUI #747) already cover them.Other.
On the open questions in #792.
PaneCanvasinside a half.Not added: Alt+drag. Tabs reorder sideways and split downward, and sidebar rows split only over the pane area, so the two gestures do not clash.
Validation
bun run typecheck: clean.bun run test:unit: passes, including newsrc/lib/split.test.ts(dock rules, hysteresis) andsrc/lib/paneDrag.test.ts.scripts/split-view-regression.ts, 6 checks, run alone twice: 6/6 both times.bun scripts/ui-regression.tson this head: 124 PASS, exit 0.